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Informational side of things

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http://www.kidsastronomy.com/jupiter.htm

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Inspirational side of things

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http://www.exploratorium.edu/ronh/age/

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Storms on jupiter remodeled in string, by Yulia Hananse

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Metis, Adrastea, Amalthea and there are over 100 more (only 60 are named).

http://en.wikipedia.org/wiki/Moons_of_Jupiter#Table

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some of Jupiter's main attractions are the giant red spot or the overall mass of the planet. Jupiter's red spot is even more giant then the Earth, however it is 300 years old and has been shrinking for all that time.

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The biggest storm on the biggest planet in the solar system is losing its punch.

New pictures from the Hubble Space Telescope show Jupiter's so-called Great Red Spot is the smallest it has been since observations began more than 100 years ago.

ANALYSIS: Go to Jupiter for the Best French Fries

The spot, which appears as a deep red oval surrounded by swirling layers of yellow, orange and white, actually is a raging storm - the largest in the solar system - with winds blasting at hundreds of thousands of miles per hour.

Scientists have known for some time that the spot is shrinking. When it was first detected in the late 1800s, it appeared to be about 25,000 miles across, which is more than the diameter of three Earths.

When NASA's twin Voyager spacecraft passed by Jupiter in 1979 and 1980, the red spot had trimmed down to about 14,500 miles in diameter.

NEWS: Why Jupiter's Red Spot Won't Die

Images taken by the Hubble Space Telescope and released on Thursday now show the spot is down to less than 10,250 miles at its widest point.

Scientists suspect the change has something to do with eddies that are feeding the storm and zapping it of energy.

"It is apparent that very small eddies are feeding into the storm ... These may be responsible for the accelerated change by altering the (storm's) internal dynamics," astronomer Amy Simon, with NASA's Goddard Space Flight Center in Greenbelt, Md., said in a statement.

So is the Great Red Spot doomed?

"That is a tough question because, of course, we don't know," Simon wrote in an email to Discovery News.

NEWS: Jupiter Is Undergoing Massive, Global Changes

"Atmospheric storms are not usually stable over very long time periods. On Earth they dissipate relatively quickly, as they do on all terrestrial planets. (Land really helps to break up storms.)

"This one is high pressure, and generally more stable than say, a hurricane, but even our best atmospheric models have a difficult time reproducing a very long-lived vortex on a gas giant planet. In other words, there is every reason why the Great Red Spot should have disappeared long ago, so it is somewhat more surprising that it hasn't," she said.

"Whether the current change in size means it is suddenly on track to go away, we'll just have to wait and see."

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Not-So-Great Red Spot: Jupiter's Epic Storm is Shrinking

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The biggest storm on the biggest planet in the solar system is losing its punch. Continue reading →

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Ancient Roman token carvings of the king God Jupiter.

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by: Yulia Hanansen

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Made out of rock, metal and hydrogen compounds

http://space-facts.com/jupiter/

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Jupiter's big red spot storm compared to earth.

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Pioneer 10 and 11, Voyager 1 and 2, Galileo, Cassini, Ulysses, and New Horizons missions have visited jupiter. The Juno will reach Jupiter in 2016.

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Jupiter is the forth brightest object in the solar system, the brightest visual magnitude for Jupiter is -2.7

http://space-facts.com/jupiter/

http://astronomy.stackexchange.com/questions/8868/how-would-jupiters-brightness-relative-to-our-sun-seem-to-a-remote-observer-ob

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some of jupiters moons are Carpo, Kore and Thyone. The moons are mostly made up of water, ice, rock, and sometimes some chemicals that are within the dirt/powder of the moons.

read more at:

https://solarsystem.nasa.gov/planets/profile.cfm?Object=Jupiter&Display=Moons

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Look at the video

https://www.youtube.com/watch?v=s56pxa9lpvo

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https://www.youtube.com/watch?v=Z1tIS-S-Mqw

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Jupiter: Mythology and Man's Early Musings

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Jupiter: Mythology and Man's Early Musings

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What was it like to live as a very early human, thousands of years ago? The world must have seemed mysterious and frightening, as well as wondrous and fantastic.

read more:

https://solarsystem.nasa.gov/scitech/display.cfm?ST_ID=525

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What was it like to live as a very early human, thousands of years ago? The world must have seemed mysterious and frightening, as well as wondrous and fantastic.

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http://www.space.com/27854-jupiter-moon-europa-amazing-photo.html

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Jupiter is the biggest planet in the solar system, 100 times the size of earth, and can fit all other non sun objects in the solar system in it 1 and a half times but is still 1/1 000 of the suns size.

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Jupiter is 779, 000, 000 km away from the sun.

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The distance from the Sun to Jupiter is approximately 779 million km, or 484 million miles. The exact number is 778,547,200 km.

This number is an average because Jupiter and the rest of the Solar System follows an elliptical orbit around the Sun. Sometimes it's closer than 779 million km, and other times it's more distant. When Jupiter is at its closest point in its orbit, astronomers call this perihelion; for Jupiter, this is 741 million km. At its most distant point, called aphelion, Jupiter gets out to 817 million km.

Astronomers use the term "astronomical unit" as another method for measuring distances in the Solar System. An astronomical unit, or AU, is the average distance from the Sun to the Earth - 150 million km. Jupiter's average distance from the Sun is 5.2 AU. Its closest point is 4.95 AU, and its most distant point is 5.46 AU.

We have written many articles about Jupiter for Universe Today. Here's an article about how Jupiter might be able to wreck the Solar System, and here's an article about Jupiter's Great Red Spot.

If you'd like more info on Jupiter, check out Hubblesite's News Releases about Jupiter, and here's a link to NASA's Solar System Exploration Guide to Jupiter.

We've also recorded an entire episode of Astronomy Cast just about Jupiter. Listen here, Episode 56: Jupiter.

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How Far is Jupiter from the Sun? - Universe Today

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The distance from the Sun to Jupiter is approximately 779 million km, or 484 million miles. The exact number is 778,547,200 km. This number is an average because Jupiter and the rest of the Solar System follows an elliptical orbit around the Sun. Sometimes it's closer than 779 million km, and other times it's more ...

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Jupiter's  Distance In The Solar     System

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Jupiter's  Distance In The Solar     System

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Jupiter is the closes gas giant to us, even though it is still very far away from mars the most outward inner planet. It is 778 500 000 kms from the sun and 588 000 000 kms from us.

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Jupiter and the moon in conjunction on the morning of Sept. 8, 2012.

Credit: Starry Night software

The largest of all of the planets in the solar system, Jupiter shines brightly in the sky despite its distance. Venus is the only planet constantly brighter than the gas giant, though at times Mars will give it a run for its money. Part of this has to do with its size and composition, but the planet grows brighter and dimmer depending on its distance from Earth.

Because both planets travel in an elliptical path around the sun, Jupiter's distance from Earth is constantly changing. When the two planets are at their closest point, the distance to Jupiter is only 365 million miles (588 million kilometers). From its closest point, Jupiter shines so brightly that even Venus dims in comparison. At its farthest, the gas giant lies 601 million miles (968 million km) away.

Jupiter takes 11.86 Earth-years to complete one orbit of the sun. As Earth travels around the sun, it catches up with Jupiter once every 398.9 days, causing the gas giant to appear to travel backwards in the night sky. This retrograde motion caused a number of problems to the original, sun-centric (or " Copernican") models of the solar system, whose perfect circles did not account for the apparent loop Jupiter and other planets made. It was not until Johannes Kepler determined that planets traveled in elliptical paths rather than circular ones that the problem was clarified.

The elliptical paths mean that the planets do not remain at a constant distance from the sun. At its closest, or perihelion, Jupiter lies 460 million miles (741 million km) from the star; at its farthest, or aphelion, it is 508 million miles (817 million km) away. On average, the distance to Jupiter is 484 million miles (778 million km).

When two bodies orbit one another, the system has its own center of mass, which generally lies closer to the more massive object. This is the point around which both bodies rotate. Thus, although we say that planets revolve around the sun, both the sun and the planets actually revolve around the center of mass point. This means that the planets have a center of mass not only with the sun but also with each other; however, the massive sun dominates the center of mass point between, say, Earth and Mercury.

In the solar system, the center of mass for most sun-planet systems (sun-Earth, sun-Venus, etc.) lies inside of our enormous star. But because Jupiter is so massive, the center of mass within the sun-Jupiter system actually lies outside of the diameter of the sun. It is the only planet whose center of mass is not located with the solar boundaries. As Jupiter orbits the sun, the giant world actually tugs on its star. Viewing similar wobbles in other stars allowed scientists to spot some of the first exoplanets.

The time it takes a spacecraft to reach the giant planet depends on a number of things. The path of a craft often varies, as it slingshots off of planets, moons, and even the sun to gain acceleration while using less fuel.

The Galileo spacecraft launched in October 1989. It took just over six years to reach the gas giant, arriving in December 1995. But the craft took a very circuitous route, traveling a distance of 2.5 billion miles. It traveled around Venus, Earth, and the asteroid Gaspra to reach Jupiter.

Voyager 1, on the other hand, took only two years to reach the gas giant. Launched on September 5, 1977, Voyager 1 made its closest approach on March 5, 1979. This was because the Voyager mission was designed to take advantage of an ideal layout of the outer planets.

The New Horizons mission took a more direct path after its January 19, 2006, launch. On February 28, 2007, it performed a flyby of Jupiter on its way to Pluto and other dwarf planets. The travel time to Jupiter was just over 13 months.

Juno, which launched on August 5, 2011, took five years to travel to the gas giant, arriving on July 4, 2016.

The European Space Agency plans to launch its JUpiter ICy moons Explorer (JUICE) mission to Jupiter in June 2022. JUICE will rely on gravity assists from Venus and Earth to make the 7.6-year cruise to the giant planet.

NASA plans to launch the Europa Clipper mission to Jupiter's moon Europa in the mid-2020s. Launching with the new Space Launch System, scheduled for its first launch in 2018, could cut the travel time from eight years to three.

"This is one of those rare cases where time really is money," then-associate administer of NASA's Science Mission Directorate John Grunsfeld told members of Congress in July 2015.

The time it took each mission to travel to the gas giant varied, and depended not only on technological leaps in propulsion systems, but also in how the planets lined up with one another.

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The largest of all of the planets in the solar system, Jupiter shines brightly in the sky despite its distance. Venus is the only planet constantly brighter than the gas giant, though at times Mars will give it a run for its money.

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The big red spot is Jupiter's biggest individual storm and one of its most noticeable features. It has been raging for more than 300 years old and 3 times the size of earth, resent studies have also showed it's shrinking.

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The astronomy pages formerly available at this address are no longer available. They were left up, without maintenance, for almost 20 years, because there were many requests from users to do so. However, astronomy and astrophysics knowledge evolves, and these pages have become too out of date to leave up without potentially misleading readers on some rapidly-evolving topics.

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Most people think of saturn as the ringed planet but all the gas giants have rings. Jupiter's rings are not very thick and are very short compared to the length of the other plant's rings.

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The Rings of Jupiter: Halo, Main and Gossamer Ring - Windows to the Universe

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There are three parts to Jupiter's rings. The innermost, cloud-like ring is called the Halo Ring. The next one out is the Main Ring, which is quite narrow and thin. Beyond the Main Ring is the wispy, nearly transparent Gossamer Ring.

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 Jupiter song by Katy McAllister Ft. Shannon McAllister

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 Jupiter song by Katy McAllister Ft. Shannon McAllister

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https://www.youtube.com/watch?v=c9lv4X35XUo

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If the sun were as tall as a typical front door, the Earth would be the size of a nickel and Jupiter would be about as big as a basketball.

read more at:

https://solarsystem.nasa.gov/planets/profile.cfm?Object=Jupiter

Live astronaught twitter feed!

http://www.nasa.gov/socialmedia

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It's mass is what keeps the asteroid belt in line and keeps it's over 100 moons in orbit. It controls most outer solar system planets, asteroids, comets, hyper belt/ asteroid belt etc.

http://www.reddit.com/r/space/comments/2ln8yv/how_jupiter_shields_the_inner_planets_from_the/

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Jupiter is the fifth planet from the Sun and the largest planet in the Solar System. It is a giant planet with a mass one-thousandth of that of the Sun, but is two and a half times that of all the other planets in the Solar System combined.

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Jupiter was formed approximately 4.5 billion years ago along with the rest of the solar system. Its core of rock and ice was the original part with gases left over from the ruble of the asteroid belt combed around it.

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Although planets surround stars in the galaxy, how they form remains a subject of debate. Despite the wealth of worlds in our own solar system, scientists still aren't certain how planets are built. Currently, two theories are duking it out for the role of champion.

While the first, core accretion, works well with the formation of terrestrial planes, scientists have difficulty reconciling it with giant planets like Jupiter. A more recent model known as disk instability may help solve some of the problems that core accretion fails to address.

Weighing in at 2.5 times the mass of the rest of the solar system planets, Jupiter played an important role in the formation and evolution of its siblings. New theories about the early solar system suggest that Jupiter may have moved around, stirring up material. The complex dance of the king of planets may have directly influenced the formation of Mars and played a role in the bombardment of the rocky planets.

Artist's conception of our solar system's solar nebula, the cloud of gas and dust from which the planets formed.

Credit: Painting copyright William K. Hartmann, Planetary Science Institute, Tucson

Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula.

With the rise of the sun, the remaining material began to clump up. Small particles drew together, bound by the force of gravity, into larger particles. The solar wind swept away lighter elements, such as hydrogen and helium, from the closer regions, leaving only heavy, rocky materials to create smaller terrestrial worlds. But farther away, the solar winds had less impact on lighter elements, allowing them to coalesce into gas giants. In this way, asteroids, comets, planets, and moons were created.

The core accretion model suggests that the rocky cores of planets formed first, then gathered lighter elements around it to form its crust and mantle. For rocky worlds, the lighter elements build up their atmosphere.

Exoplanet observations seem to confirm core accretion as the dominant formation process. Stars with more "metals" - a term astronomers use for elements other than hydrogen and helium - in their cores have more giant planets than their metal-poor cousins. According to NASA, core accretion suggests that small, rocky worlds should be more common than the more massive gas giants.

The 2005 discovery of a giant planet with a massive core orbiting the sun-like star HD 149026 is an example of an exoplanet that helped strengthen the case for core accretion.

"This is a confirmation of the core accretion theory for planet formation and evidence that planets of this kind should exist in abundance," said Greg Henry in a press release. Henry, an astronomer at Tennessee State University, Nashville, detected the dimming of the star.

In 2017, the European Space Agency plans to launch the CHaracterising ExOPlanet Satellite (CHEOPS), which will study exoplanets ranging in sizes from super-Earths to Neptune. Studying these distant worlds may help determine how planets in the solar system formed.

"In the core accretion scenario, the core of a planet must reach a critical mass before it is able to accrete gas in a runaway fashion," said the CHEOPS team.

"This critical mass depends upon many physical variables, among the most important of which is the rate of planetesimals accretion."

By studying how growing planets accrete material, CHEOPS will provide insight into how worlds grow.

The disk instability model

For massive gas giants like Jupiter, however, core accretion takes far too long. The cloud of material around the sun only lasts a short time it is either gathered up by planets or evaporates completely.

"Giant planets form really fast, in a few million years," Kevin Walsh, a researcher at the Southwest Research Institute in Boulder, Colorado, told Space.com. "That creates a time limit because the gas disk around the sun only lasts 4 to 5 million years."

While rocky planets have plenty of time to build up their heavier atmospheres, or collect them from material crashing into the planet, the atmospheres of gas giants are too light and disappear too quickly. For instance, Jupiter is composed almost completely of hydrogen, with about 10 percent of its volume made up of helium. Small traces of other elements exist in Jupiter's atmosphere, as well, but most of its mass is held by these two basic elements. Scientists had to look for a new way to build the larger planets.

According to a relatively new theory, disk instability, clumps of dust and gas are bound together early in the life of the solar system. Over time, these clumps slowly compact into a giant planet. These planets can form faster than their core accretion rivals, sometimes in as little as a thousand years, allowing them to trap the rapidly-vanishing lighter gases. They also quickly reach an orbit-stabilizing mass that keeps them from death-marching into the sun.

Like all planets, the frequent collisions elevated temperatures on Jupiter. Dense materials sank to the center, forming the core. Some scientists theorize that the core today might be a hot molten ball of liquid, while other research indicates that it could be a solid rock 14 to 18 times the mass of the Earth.

The biggest challenge to core accretion is time - building massive gas giants fast enough to grab the lighter components of their atmosphere. Recent research on how smaller, pebble-sized objects fused together to build giant planets up to 1000 times faster than earlier studies.

"This is the first model that we know about that you start out with a pretty simple structure for the solar nebula from which planets form, and end up with the giant-planet system that we see," study lead author Harold Levison, an astronomer at the Southwest Research Institute (SwRI) in Colorado, told Space.com in 2015.

In 2012, researchers Michiel Lambrechts and Anders Johansen from Lund University in Sweden proposed that tiny pebbles, once written off, held the key to rapidly building giant planets.

"They showed that the leftover pebbles from this formation process, which previously were thought to be unimportant, could actually be a huge solution to the planet-forming problem," Levison said.

Levison and his team built on that research to model more precisely how the tiny pebbles could form planets seen in the galaxy today. While previous simulations, both large and medium-sized objects consumed their pebble-sized cousins at a relatively constant rate, Levison's simulations suggest that the larger objects acted more like bullies, snatching away pebbles from the mid-sized masses to grow at a far faster rate.

"The larger objects now tend to scatter the smaller ones more than the smaller ones scatter them back, so the smaller ones end up getting scattered out of the pebble disk," study co-author Katherine Kretke, also from SwRI, told Space.com. "The bigger guy basically bullies the smaller one so they can eat all the pebbles themselves, and they can continue to grow up to form the cores of the giant planets."

Dancing planets

Originally, scientists thought that planets formed around the same place they live today. The discovery of exoplanets revealed that, around other stars at least, some worlds moved from their natal neighborhood. The first exoplanets were 'hot Jupiters', massive gas giants larger than Jupiter that orbited their star in days or even hours. These worlds couldn't have formed in place, because temperatures were too high for them to collect hydrogen and helium. Scientists quickly concluded that at least some gas giants in the universe migrated in.

At the same time, the solar system suffered from what many call 'the small Mars problem.' While simulations of planetary formation accounted for all the other worlds, in the right size and location, none could adequately reproduce the red planet. Instead, the created a much smaller world in the Martian orbit.

In 2011, scientists unveiled the Grand Tack model. In the new model, Jupiter moves inward toward the sun, scattering material in front of it. Eventually, it travels in to where Mars travels today, a distance of about 1.5 times Earth's orbit.

Left alone, Jupiter might have plowed through the inner solar system. "People were modeling how to keep Jupiter from migrating inward toward the sun," said Walsh, one of the scientists who proposed Grand Tack.

Walsh and his colleagues found that including Saturn as a traveling buddy caused Jupiter to reverse in its tracks, like a sailboat tacking in the wind. Both planets eventually returned to the outer solar system and settled into their current orbit.

A good neighbor

Because the massive planet formed so early in the history of the solar system, it most likely impacted the creation and paths of other planets. The planet itself would have had sufficient mass to alter the path of other baby planets that traveled near it, sending them veering either into the outermost reaches of the solar system or toward a fiery death near the sun. Comets and asteroids could have been similarly cast out.

Jupiter is often lauded as a shield for Earth, but that may not have always been the case. Recent studies suggest that gas giants speed up the timescale of impacts. Early in the life of the solar system, Jupiter tossed material helter-skelter, raining some of it on the terrestrial planets while hurling some of it completely out of the solar system. In systems without Jupiters, however, the impacts are weaker but continue through a planet's lifetime. That's because most of the rocks are stuck in orbit around the sun without a giant planet to boot it aside.

"The terrestrial planets basically aren't giving them enough kick to leave the system," Elisa Quintana, a research scientist at NASA Ames Research Center, told Space.com. Quintana studied the role of Jupiter-sized planets and impacts on terrestrial worlds.

"For our solar system, Jupiter had a great effect," she said.

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Although planets surround stars in the galaxy, how they form remains a subject of debate. Despite the wealth of worlds in our own solar system, scientists still aren't certain how planets are built. Currently, two theories are duking it out for the role of champion.

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http://www.jupiterascending.com

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It is made mostly of non compact cold gases swirling in storms made of 90% hydrogen, 10% helium, and 0.7% trace gases going down to a Neptune size cold silicon and ice.

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Jupiter is the fifth and largest planet in our solar system. This gas giant has 16 moons and a dark, barely-visible ring. Its most prominent features are bands across its latitudes and a great red spot (which is a storm).

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Jupiter is in the outer part of the universe and because it is heavy it also is harder for the sun to keep in orbit making its year 12 earth years and 29 earth days.

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When it comes to the other planets that make up our Solar System, some pretty stark differences become apparent. In addition to being different in terms of their sizes, composition and atmospheres from Earth, they also differ considerably in terms of their orbits. Whereas those closest to the Sun have rapid transits, and therefore comparatively short years, those farther away can take many Earth to complete a single orbit.

This is certainly the case when it comes to Jupiter, the Solar System largest and most massive planet. Given its considerable distance from the Sun, Jupiter spends the equivalent of almost twelve Earth years completing a single circuit of our Sun. Orbiting at this distance is part of what allows Jupiter to maintain its gaseous nature, and led to its formation and peculiar composition.

Orbit and Resonance:

Jupiter orbits the Sun at an average distance (semi-major axis) of 778,299,000 km (5.2 AU), ranging from 740,550,000 km (4.95 AU) at perihelion and 816,040,000 km (5.455 AU) at aphelion. At this distance, Jupiter takes 11.8618 Earth years to complete a single orbit of the Sun. In other words, a single Jovian year lasts the equivalent of 4,332.59 Earth days.

However, Jupiter's rotation is the fastest of all the Solar System's planets, completing a rotation on its axis in slightly less than ten hours (9 hours, 55 minutes and 30 seconds to be exact. Therefore, a single Jovian year lasts 10,475.8 Jovian solar days. This orbital period is two-fifths that of Saturn, which means that the two largest planets in our Solar System form a 5:2 orbital resonance.

Seasonal Changes:

With an axial tilt of just 3.13 degrees, Jupiter also has one of the least inclined orbits of any planet in the Solar System. Only Mercury and Venus have more vertical axes, with a tilt of 0.03° and 2.64° respectively. As a result, Jupiter does not experience seasonal changes the way the other planets do - particularly Earth (23.44°), Mars (25.19°) and Saturn (26.73°).

As a result, temperatures do not vary considerably between the northern or southern hemispheres during the course of its orbit. Measurements taken from the top of Jupiter's clouds (which is considered to be the surface) indicate that surface temperatures vary between 165 K and 112 K (-108 °C and -161 °C). However, temperatures vary considerably due to depth, increasing drastically as one ventures closer to the core.

Formation:

Jupiter's composition and position in the Solar System are interrelated. According to Nebular Theory, the Sun and all the planets of our Solar System began as a giant cloud of molecular gas and dust (called a solar nebula). Then, about 4.57 billion years ago, something happened that caused the cloud to collapse, which could have been the result of anything from a passing star to shock waves from a supernova.

From this collapse, pockets of dust and gas began to collect into denser regions. As the denser regions pulled in more and more matter, conservation of momentum caused them to begin rotating, while increasing pressure caused them to heat up. Since temperatures across this protoplanetary disk were not uniform, this caused different materials to condense at different temperatures, leading to different types of planets forming.

The dividing line for the different planets in our solar system is known as the "Frost Line", a point in the Solar System beyond which volatiles (such as water, ammonia, methane, carbon dioxide and carbon monoxide) are able to exist in a frozen state. As a result, planets like Jupiter, which are located beyond the Frost Line, condensed out of denser materials first (like silicate rock and minerals), then were able to accumulate gases in a liquid state.

In addition to ensuring that Jupiter was able to become the massive gas giant it is today, its distance from the Sun is also what makes its orbital period much longer than that of Earth's.

We have written many articles about Jupiter here at Universe Today. Here's The Gas Giant Jupiter, Ten Interesting Facts About Jupiter, Jupiter Compared to Earth, How Long Does it Take to get to Jupiter?, Could We Terraform Jupiter?

If you'd like more information on Jupiter, check out Hubblesite's News Releases about Jupiter. And here's an article about Jupiter on the NASA Solar System Exploration Guide.

We have also recorded an episode of Astronomy Cast about Jupiter. You can listen here, Episode 56: Jupiter.

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The Orbit of Jupiter. How Long is a Year on Jupiter? - Universe Today

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When it comes to the other planets that make up our Solar System, some pretty stark differences become apparent. In addition to being different in terms of their sizes, composition and atmospheres from Earth, they also differ considerably in terms of their orbits.

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Its great gravity pulls on it as it spins making a full rotation 9 earth hours and 56 earth minutes.

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The Universe Today readers are always asking great questions. "How long is a day on Jupiter?", is one of them. A day on Jupiter, also known as the sidereal rotation period, lasts 9.92496 hours. Jupiter is the fastest rotating body in our Solar System. Determining the length of a day on Jupiter was very difficult, because, unlike the terrestrial planets, it does not have surface features that scientists could use to determine its rotational speed.

Scientists cast about for ways to judge the planet's rotational speed. An early attempt was to do some storm watching. Jupiter is constantly buffeted by atmospheric storms, so the theory was that you could locate the center of a storm and get some idea of the length of a day. The problem scientists encountered was that the storms on Jupiter are very fast moving, making them an inaccurate source of rotational information. Scientist were finally able to use radio emissions from Jupiter's magnetic field to calculate the planet's rotational period and speed. While other parts of the planet rotate at different speeds, the speed as measured by the magnetosphere is used as the official rotational speed and period.

All of the planets are oblate spheroids with varying degrees of flattening. Jupiter's extremely fast rotation flattens it more than any other planet. The diameter of the equator is 9275 km more than the distance from pole to pole. Another interesting effect of Jupiter's rotational speed is that, because Jupiter is not a solid body, its upper atmosphere features differential rotation. The atmosphere above the poles rotates about five minutes slower than the atmosphere at the equator.

Jupiter is almost a solar system unto itself. Many astronomers believe the the planet is simply a failed star, just lacking the mass needed to ignite fusion. Many people are aware of its four largest moons, the Galilean moons Io, Europa, Ganymede, and Callisto, but few realize that Jupiter has 50 confirmed moons and at least 14 provisional moons. The four largest moons are all very interesting to scientists. Io is a volcanic nightmare. Europa is covered in water ice and may have oceans of slushy ice underneath. Ganymede is the largest moon in the Solar System, even bigger than Mercury, and is the only moon known to have an internally generated magnetic field like Earth's. Callisto is interesting because its surface is thought to be very ancient; perhaps original material from the birth of the Solar System.

Knowing "how long is a day on Jupiter" just scratches the surface of the intrigue that is the Jovian system. You could spend months researching the planet and its moons, yet have more to research to do.

Here's an article on Universe Today that shows how Jupiter can be very flattened, and an article about how the powerful windstorms are generated from its rotation.

NASA's Ask an Astronomer also has an answer for the question, "how long is a day on Jupiter?" And a cool video of Jupiter's rotation.

We've also recorded an entire show just on Jupiter for Astronomy Cast. Listen to it here, Episode 56: Jupiter, and Episode 57: Jupiter's Moons.

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How Long is a Day on Jupiter - Universe Today

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The Universe Today readers are always asking great questions. "How long is a day on Jupiter?", is one of them. A day on Jupiter, also known as the sidereal rotation period, lasts 9.92496 hours. Jupiter is the fastest rotating body in our Solar System. Determining the length of a day on Jupiter was very difficult, ...

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It is the second heaviest object in the solar system next to the sun,

more then twice as heavy as all the planets added up. 1.898E27kgs.

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Jupiter mass ( M J or M Jup) is the unit of mass equal to the total mass of the planet Jupiter (, 317.83 Earth mass; one Earth mass equals 0.00315 Jupiter masses). Jupiter mass is used to describe masses of the gas giants, such as the outer planets and extrasolar planets.

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It is 317.83 times as massive as the earth and has a circumference of approximately 449 200 kilometers.

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The largest planet in the solar system, the gas giant Jupiter is approximately 318 times as massive as Earth. If the mass of all of the other planets in the solar system were combined into one "super planet," Jupiter would still be two and a half times as large.

Radius, diameter and circumference

Jupiter has a mean radius of 43,440.7 miles (69,911 kilometers), about a tenth that of the sun. However, its rapid rotation - it spins once every 9.8 hours - causes it to bulge at the equator, where the diameter is 88,846 miles (142,984 km). In contrast, the diameter at the poles is only 83,082 miles (133,708 km). This stretched shape is known as an oblate spheroid.

If you were to walk around the equator of Jupiter, you would travel 272,946 miles (439,264 km), over 10 times the distance around Earth's center line.

Because Jupiter is made of gas, mostly, its surface is considered uniform. As such, it lacks high and low points - mountains and valleys - such as those found on rocky terrestrial planets.

Density, mass and volume

Known as a gas giant, Jupiter is composed primarily of hydrogen and helium. It weighs in at 1.9 x 10 ²⁷ kilograms. Although it is significantly more massive than Earth, it is only a fifth as dense, at 1,326g/cm ³, because it is made of gas rather than rock.

The volume of Jupiter is 1,431,281,810,739,360 cubic kilometers, 1,321 times that of Earth.

The surface area of this enormous planet is 23,713,907,537 square miles, or 6.1419x10 ¹⁰ square kilometers, 120 times that of our planet.

Jupiter's structure resembles that of the sun, but would need to be 75 times its present mass to undergo the fusion of hydrogen that fuels a star. The mass of the largest gas giant planets found outside of the solar system is often given in terms of the enormous planet.

- Nola Taylor Redd, SPACE.com Contributor

Related:

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The largest planet in the solar system, the gas giant Jupiter is approximately 318 times as massive as Earth. If the mass of all of the other planets in the solar system were combined into one "super planet," Jupiter would still be two and a half times as large.

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Mass: 1,898,130,000,000,000,000 billion kg (317.83 x Earth)
Known Moons: 67
Known Rings: 4
Orbit Distance: 778,340,821 km (5.20 AU)
Orbit Period: 4,332.82 Earth days (11.86 Earth years)
Temperature on Surface: -108°C

http://space-facts.com/jupiter/

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Jupiters axis is 3.13 degrees which makes this planet to not have very bog seasonal changes

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Pronunciation
[1]

Jupiter

Adjectives

Jovian

Symbol

Epoch J2000

Aphelion

5.4570 AU (816.363 million km)

Perihelion

4.9506 AU (740.595 million km)

Eccentricity

0.0489

398.88 d

Inclination

Known satellites

95 (as of 2023)[7]

69,911 km (43,441 mi)[a]
10.973 of Earth's

71,492 km (44,423 mi)11.209 0.10045 [a]
R🜨 ( of Earth's) R☉ (
of Sun's)

66,854 km (41,541 mi)[a]
10.517 of Earth's

Flattening

0.06487

6.1469×10 ¹⁰ km ² (2.3733×10 ¹⁰ sq mi)
120.4 of Earth's

Volume

1.4313×10 ¹⁵ km ³ (3.434×10 ¹⁴ cu mi)[a]
1,321 of Earth's

Mass

1.8982×10 ²⁷ kg (4.1848×10 ²⁷ lb)

317.8 of Earth's

1/1047 of Sun's[10]

1.326 g/ cm³ (0.0479 lb/cu in)[b]

24.79 m/s² (81.3 ft/s²)[a]
2.528 g

0.2756±0.0006 [11]

9.9258 h (9 h 55 m 33 s)[3]

Equatorial rotation velocity

12.6 km/s (7.8 mi/s; 45,000 km/h)

268.057°; 17 h 52 m 14 s

0.503 ( Bond)[12]
0.538 ( geometric)[13]

Temperature

88 K (−185 °C) ( blackbody temperature)

Surface temp.

min

mean

max

1 bar

165 K

0.1 bar

78 K

128 K

−2.94[14] to −1.66[14]

−9.4[15]

200-600 kPa (30-90 psi)
(opaque cloud deck)[16]

Composition by volume

11.86 Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, and slightly less than one one-thousandth the mass of the Sun. Jupiter orbits the Sun at a distance of 5.20 AU (778.5 Gm) with an orbital period of years. Jupiter is the third brightest natural object in the Earth's night sky after the Moon and Venus, and it has been observed since prehistoric times. It was named after Jupiter, the chief deity of ancient Roman religion.

Jupiter was the first planet to form, and its inward migration during the primordial Solar System impacted much of the formation history of the other planets. Jupiter is primarily composed of hydrogen (90% by volume), followed by helium, which makes up a quarter of its mass and a tenth of its volume. The ongoing contraction of Jupiter's interior generates more heat than the planet receives from the Sun. Its internal structure is believed to consist of an outer mantle of fluid metallic hydrogen, and a diffuse inner core of denser material. Because of its rapid rotation rate of 1 rotation per 10 hours, Jupiter's shape is an oblate spheroid: it has a slight but noticeable bulge around the equator. The outer atmosphere is divided into a series of latitudinal bands, with turbulence and storms along their interacting boundaries. The most obvious result of this is the Great Red Spot, a giant storm which has been observed since 1831 and possibly earlier.

Jupiter is surrounded by a faint planetary ring system and has a powerful magnetosphere, the second largest contiguous structure in the Solar System (after the heliosphere). Jupiter forms a system of 95 known moons and probably many more, including the four large moons discovered by Galileo Galilei in 1610: Io, Europa, Ganymede, and Callisto. Ganymede, the largest of the four, is larger than the planet Mercury. Callisto is the second largest; Io and Europa are approximately the size of Earth's Moon.

Since 1973, Jupiter has been visited by nine robotic probes: seven flybys and two dedicated orbiters, with one more en route and one awaiting launch.

Name and symbol

In both the ancient Greek and Roman civilizations, Jupiter was named after the chief god of the divine pantheon: Zeus to the Greeks and Jupiter to the Romans.[17] The International Astronomical Union formally adopted the name Jupiter for the planet in 1976, and has since named its newly discovered satellites for the god's lovers, favourites, and descendants.[18] The planetary symbol for Jupiter, , descends from a Greek zeta with a horizontal stroke, ⟨Ƶ⟩, as an abbreviation for Zeus.[19][20]

In Latin, Iovis is the genitive case of , i.e. Jupiter. It is associated with the etymology of Zeus ('sky father'). The English equivalent, Jove, is only known to have come into use as a poetic name for the planet around the 14th century.

Jovian is the adjectival form of Jupiter. The older adjectival form jovial, employed by astrologers in the Middle Ages, has come to mean 'happy' or 'merry', moods ascribed to Jupiter's influence in astrology.

The original Greek deity Zeus supplies the root zeno-, which is used to form some Jupiter-related words, such as zenographic.

Formation and migration

Jupiter is believed to be the oldest planet in the Solar System, having formed just one million years after the Sun and roughly 50 million years before Earth. Current models of Solar System formation suggest that Jupiter formed at or beyond the snow line: a distance from the early Sun where the temperature was sufficiently cold for volatiles such as water to condense into solids. The planet began as a solid core, which then accumulated its gaseous atmosphere. As a consequence, the planet must have formed before the solar nebula was fully dispersed. During its formation, Jupiter's mass gradually increased until it had 20 times the mass of the Earth, approximately half of which was made up of silicates, ices and other heavy-element constituents. When the proto-Jupiter grew larger than 50 Earth masses it created a gap in the solar nebula. Thereafter, the growing planet reached its final mass in 3-4 million years. Since Jupiter is made of the same elements as the Sun (hydrogen and helium) it has been suggested that the Solar System might have been early in its formation a system of multiple protostars, which are quite common, with Jupiter being the second but failed protostar. But the Solar System never developed into a system of multiple stars and Jupiter today does not qualify as a protostar or brown dwarf since it does not have enough mass to fuse hydrogen.

According to the " grand tack hypothesis", Jupiter began to form at a distance of roughly 3.5 AU (520 million km; 330 million mi) from the Sun. As the young planet accreted mass, interaction with the gas disk orbiting the Sun and orbital resonances with Saturn caused it to migrate inward. This upset the orbits of several super-Earths orbiting closer to the Sun, causing them to collide destructively. Saturn would later have begun to migrate inwards at a faster rate than Jupiter, until the two planets became captured in a 3:2 mean motion resonance at approximately 1.5 AU (220 million km; 140 million mi) from the Sun. This changed the direction of migration, causing them to migrate away from the Sun and out of the inner system to their current locations. All of this happened over a period of 3-6 million years, with the final migration of Jupiter occurring over several hundred thousand years. Jupiter's migration from the inner solar system eventually allowed the inner planets-including Earth-to form from the rubble.

There are several unresolved issues with the grand tack hypothesis. The resulting formation timescales of terrestrial planets appear to be inconsistent with the measured elemental composition. It is likely that Jupiter would have settled into an orbit much closer to the Sun if it had migrated through the solar nebula. Some competing models of Solar System formation predict the formation of Jupiter with orbital properties that are close to those of the present day planet. Other models predict Jupiter forming at distances much farther out, such as 18 AU (2.7 billion km; 1.7 billion mi).

According to the Nice model, infall of proto- Kuiper belt objects over the first 600 million years of Solar System history caused Jupiter and Saturn to migrate from their initial positions into a 1:2 resonance, which caused Saturn to shift into a higher orbit, disrupting the orbits of Uranus and Neptune, depleting the Kuiper belt, and triggering the Late Heavy Bombardment.

Based on Jupiter's composition, researchers have made the case for an initial formation outside the molecular nitrogen (N ₂) snowline, which is estimated at 20-30 AU (3.0-4.5 billion km; 1.9-2.8 billion mi) from the Sun, and possibly even outside the argon snowline, which may be as far as 40 AU (6.0 billion km; 3.7 billion mi). Having formed at one of these extreme distances, Jupiter would then have, over a roughly 700,000-year period, migrated inwards to its current location, during an epoch approximately 2-3 million years after the planet began to form. In this model, Saturn, Uranus, and Neptune would have formed even further out than Jupiter, and Saturn would also have migrated inwards.

Physical characteristics

Jupiter is a gas giant, meaning its chemical composition is primarily hydrogen and helium. These materials are classified as gasses in planetary geology, a term that does not denote the state of matter. It is the largest planet in the Solar System, with a diameter of 142,984 km (88,846 mi) at its equator, giving it a volume 1,321 times that of the Earth. Its average density, 1.326 g/cm ³, is lower than those of the four terrestrial planets.

Composition

By mass, Jupiter's atmosphere is approximately 76% hydrogen and 24% helium, though, because helium atoms are more massive than hydrogen molecules, Jupiter's upper atmosphere is about 90% hydrogen and 10% helium by volume. The atmosphere also contains trace amounts of methane, water vapour, ammonia, and silicon-based compounds, as well as fractional amounts of carbon, ethane, hydrogen sulfide, neon, oxygen, phosphine, and sulfur. The outermost layer of the atmosphere contains crystals of frozen ammonia. Through infrared and ultraviolet measurements, trace amounts of benzene and other hydrocarbons have also been found. The interior of Jupiter contains denser materials-by mass it is roughly 71% hydrogen, 24% helium, and 5% other elements.

The atmospheric proportions of hydrogen and helium are close to the theoretical composition of the primordial solar nebula. Neon in the upper atmosphere only consists of 20 parts per million by mass, which is about a tenth as abundant as in the Sun. Jupiter's helium abundance is about 80% that of the Sun due to precipitation of these elements as helium-rich droplets, a process that happens deep in the planet's interior.

Based on spectroscopy, Saturn is thought to be similar in composition to Jupiter, but the other giant planets Uranus and Neptune have relatively less hydrogen and helium and relatively more of the next most common elements, including oxygen, carbon, nitrogen, and sulfur. These planets are known as ice giants because during their formation these elements are thought to have been incorporated into them as ices; however, they probably contain little ice today.

Size and mass

Jupiter's mass is 318 times that of Earth; 2.5 times that of all the other planets in the Solar System combined. It is so massive that its barycentre with the Sun lies above the Sun's surface at 1.068 solar radii from the Sun's centre. Jupiter's radius is about one tenth the radius of the Sun, and its mass is one thousandth the mass of the Sun, as the densities of the two bodies are similar. A " Jupiter mass" ( M J or M Jup) is often used as a unit to describe masses of other objects, particularly extrasolar planets and brown dwarfs. For example, the extrasolar planet HD 209458 b has a mass of 0.69 M J, while the brown dwarf Gliese 229 b has a mass of 60.4 M J.

Theoretical models indicate that if Jupiter had over 40% more mass, the interior would be so compressed that its volume would decrease despite the increasing amount of matter. For smaller changes in its mass, the radius would not change appreciably. As a result, Jupiter is thought to have about as large a diameter as a planet of its composition and evolutionary history can achieve. The process of further shrinkage with increasing mass would continue until appreciable stellar ignition was achieved. Although Jupiter would need to be about 75 times more massive to fuse hydrogen and become a star, its diameter is sufficient as the smallest red dwarf may be only slightly larger in radius than Saturn.

Jupiter radiates more heat than it receives through solar radiation, due to the Kelvin-Helmholtz mechanism within its contracting interior. This process causes Jupiter to shrink by about 1 mm (0.039 in)/yr. At the time of its formation, Jupiter was hotter and was about twice its current diameter.

Internal structure

Before the early 21st century, most scientists proposed one of two scenarios for the formation of Jupiter. If the planet accreted first as a solid body, it would consist of a dense core, a surrounding layer of fluid metallic hydrogen (with some helium) extending outward to about 80% of the radius of the planet, and an outer atmosphere consisting primarily of molecular hydrogen. Alternatively, if the planet collapsed directly from the gaseous protoplanetary disk, it was expected to completely lack a core, consisting instead of a denser and denser fluid (predominantly molecular and metallic hydrogen) all the way to the centre. Data from the Juno mission showed that Jupiter has a diffuse core that mixes into its mantle, extending for 30-50% of the planet's radius, and comprising heavy elements with a combined mass 7-25 times the Earth. This mixing process could have arisen during formation, while the planet accreted solids and gases from the surrounding nebula. Alternatively, it could have been caused by an impact from a planet of about ten Earth masses a few million years after Jupiter's formation, which would have disrupted an originally solid Jovian core.

Outside the layer of metallic hydrogen lies a transparent interior atmosphere of hydrogen. At this depth, the pressure and temperature are above molecular hydrogen's critical pressure of 1.3 MPa and critical temperature of 33 K (−240.2 °C; −400.3 °F). In this state, there are no distinct liquid and gas phases-hydrogen is said to be in a supercritical fluid state. The hydrogen and helium gas extending downward from the cloud layer gradually transitions to a liquid in deeper layers, possibly resembling something akin to an ocean of liquid hydrogen and other supercritical fluids. Physically, the gas gradually becomes hotter and denser as depth increases.

Rain-like droplets of helium and neon precipitate downward through the lower atmosphere, depleting the abundance of these elements in the upper atmosphere. Calculations suggest that helium drops separate from metallic hydrogen at a radius of 60,000 km (37,000 mi) (11,000 km (6,800 mi) below the cloud tops) and merge again at 50,000 km (31,000 mi) (22,000 km (14,000 mi) beneath the clouds). Rainfalls of diamonds have been suggested to occur, as well as on Saturn and the ice giants Uranus and Neptune.

The temperature and pressure inside Jupiter increase steadily inward as the heat of planetary formation can only escape by convection. At a surface depth where the atmospheric pressure level is 1 bar (0.10 MPa), the temperature is around 165 K (−108 °C; −163 °F). The region where supercritical hydrogen changes gradually from a molecular fluid to a metallic fluid spans pressure ranges of 50-400 GPa with temperatures of 5,000-8,400 K (4,730-8,130 °C; 8,540-14,660 °F), respectively. The temperature of Jupiter's diluted core is estimated to be 20,000 K (19,700 °C; 35,500 °F) with a pressure of around 4,000 GPa.

Atmosphere

Timelapse of Jupiter's cloud system moving over the course of one month (photographed during Voyager 1 flyby in 1979)

The atmosphere of Jupiter is primarily composed of molecular hydrogen and helium, with a smaller amount of other compounds such as water, methane, hydrogen sulfide, and ammonia. Jupiter's atmosphere extends to a depth of approximately 3,000 km (2,000 mi) below the cloud layers.

Cloud layers

Jupiter is perpetually covered with clouds of ammonia crystals, which may contain ammonium hydrosulfide as well. The clouds are located in the tropopause layer of the atmosphere, forming bands at different latitudes, known as tropical regions. These are subdivided into lighter-hued zones and darker belts. The interactions of these conflicting circulation patterns cause storms and turbulence. Wind speeds of 100 metres per second (360 km/h; 220 mph) are common in zonal jet streams. The zones have been observed to vary in width, colour and intensity from year to year, but they have remained stable enough for scientists to name them.

The cloud layer is about 50 km (31 mi) deep, and consists of at least two decks of ammonia clouds: a thin clearer region on top with a thick lower deck. There may be a thin layer of water clouds underlying the ammonia clouds, as suggested by flashes of lightning detected in the atmosphere of Jupiter. These electrical discharges can be up to a thousand times as powerful as lightning on Earth. The water clouds are assumed to generate thunderstorms in the same way as terrestrial thunderstorms, driven by the heat rising from the interior. The Juno mission revealed the presence of "shallow lightning" which originates from ammonia-water clouds relatively high in the atmosphere. These discharges carry "mushballs" of water-ammonia slushes covered in ice, which fall deep into the atmosphere. Upper-atmospheric lightning has been observed in Jupiter's upper atmosphere, bright flashes of light that last around 1.4 milliseconds. These are known as "elves" or "sprites" and appear blue or pink due to the hydrogen.

The orange and brown colours in the clouds of Jupiter are caused by upwelling compounds that change colour when they are exposed to ultraviolet light from the Sun. The exact makeup remains uncertain, but the substances are thought to be made up of phosphorus, sulfur or possibly hydrocarbons. These colourful compounds, known as chromophores, mix with the warmer clouds of the lower deck. The light-coloured zones are formed when rising convection cells form crystallising ammonia that hides the chromophores from view.

Jupiter has a low axial tilt, thus ensuring that the poles always receive less solar radiation than the planet's equatorial region. Convection within the interior of the planet transports energy to the poles, balancing out temperatures at the cloud layer.

Great Red Spot and other vortices

Close-up of the Great Red Spot imaged by the Juno spacecraft in true color. Due to the way Juno takes photographs, stitched image has extreme barrel distortion.

A well-known feature of Jupiter is the Great Red Spot, a persistent anticyclonic storm located 22° south of the equator. It was first observed in 1831, and possibly as early as 1665. Images by the Hubble Space Telescope have shown two more "red spots" adjacent to the Great Red Spot. The storm is visible through Earth-based telescopes with an aperture of 12 cm or larger. The oval object rotates counterclockwise, with a period of about six days. The maximum altitude of this storm is about 8 km (5 mi) above the surrounding cloud tops. The Spot's composition and the source of its red colour remain uncertain, although photodissociated ammonia reacting with acetylene is a likely explanation.

The Great Red Spot is larger than the Earth. Mathematical models suggest that the storm is stable and will be a permanent feature of the planet. However, it has significantly decreased in size since its discovery. Initial observations in the late 1800s showed it to be approximately 41,000 km (25,500 mi) across. By the time of the flybys in 1979, the storm had a length of 23,300 km (14,500 mi) and a width of approximately 13,000 km (8,000 mi). Hubble observations in 1995 showed it had decreased in size to 20,950 km (13,020 mi), and observations in 2009 showed the size to be 17,910 km (11,130 mi). As of 2015, the storm was measured at approximately 16,500 by 10,940 km (10,250 by 6,800 mi), and was decreasing in length by about 930 km (580 mi) per year. In October 2021, a Juno flyby mission measured the depth of the Great Red Spot, putting it at around 300-500 kilometres (190-310 mi).

Juno missions show that there are several polar cyclone groups at Jupiter's poles. The northern group contains nine cyclones, with a large one in the centre and eight others around it, while its southern counterpart also consists of a centre vortex but is surrounded by five large storms and a single smaller one for a total of 7 storms.

In 2000, an atmospheric feature formed in the southern hemisphere that is similar in appearance to the Great Red Spot, but smaller. This was created when smaller, white oval-shaped storms merged to form a single feature-these three smaller white ovals were formed in 1939-1940. The merged feature was named Oval BA. It has since increased in intensity and changed from white to red, earning it the nickname "Little Red Spot".

In April 2017, a "Great Cold Spot" was discovered in Jupiter's thermosphere at its north pole. This feature is 24,000 km (15,000 mi) across, 12,000 km (7,500 mi) wide, and 200 °C (360 °F) cooler than surrounding material. While this spot changes form and intensity over the short term, it has maintained its general position in the atmosphere for more than 15 years. It may be a giant vortex similar to the Great Red Spot, and appears to be quasi-stable like the vortices in Earth's thermosphere. This feature may be formed by interactions between charged particles generated from Io and the strong magnetic field of Jupiter, resulting in a redistribution of heat flow.

Magnetosphere

Jupiter's magnetic field is the strongest of any planet in the Solar System, with a dipole moment of 4.170 gauss (0.4170 mT) that is tilted at an angle of 10.31° to the pole of rotation. The surface magnetic field strength varies from 2 gauss (0.20 mT) up to 20 gauss (2.0 mT). This field is thought to be generated by eddy currents-swirling movements of conducting materials-within the fluid, metallic hydrogen core. At about 75 Jupiter radii from the planet, the interaction of the magnetosphere with the solar wind generates a bow shock. Surrounding Jupiter's magnetosphere is a magnetopause, located at the inner edge of a magnetosheath-a region between it and the bow shock. The solar wind interacts with these regions, elongating the magnetosphere on Jupiter's lee side and extending it outward until it nearly reaches the orbit of Saturn. The four largest moons of Jupiter all orbit within the magnetosphere, which protects them from solar wind.

The volcanoes on the moon Io emit large amounts of sulfur dioxide, forming a gas torus along its orbit. The gas is ionized in Jupiter's magnetosphere, producing sulfur and oxygen ions. They, together with hydrogen ions originating from the atmosphere of Jupiter, form a plasma sheet in Jupiter's equatorial plane. The plasma in the sheet co-rotates with the planet, causing deformation of the dipole magnetic field into that of a magnetodisk. Electrons within the plasma sheet generate a strong radio signature, with short, superimposed bursts in the range of 0.6-30 MHz that are detectable from Earth with consumer-grade shortwave radio receivers. As Io moves through this torus, the interaction generates Alfvén waves that carry ionized matter into the polar regions of Jupiter. As a result, radio waves are generated through a cyclotron maser mechanism, and the energy is transmitted out along a cone-shaped surface. When Earth intersects this cone, the radio emissions from Jupiter can exceed the radio output of the Sun.

Planetary rings

Jupiter has a faint planetary ring system composed of three main segments: an inner torus of particles known as the halo, a relatively bright main ring, and an outer gossamer ring. These rings appear to be made of dust, whereas Saturn's rings are made of ice. The main ring is most likely made out of material ejected from the satellites Adrastea and Metis, which is drawn into Jupiter because of the planet's strong gravitational influence. New material is added by additional impacts. In a similar way, the moons Thebe and Amalthea are believed to produce the two distinct components of the dusty gossamer ring. There is evidence of a fourth ring that may consist of collisional debris from Amalthea that is strung along the same moon's orbit.

Orbit and rotation

Jupiter is the only planet whose barycentre with the Sun lies outside the volume of the Sun, though by only 7% of the Sun's radius. The average distance between Jupiter and the Sun is 778 million km (5.2 AU) and it completes an orbit every 11.86 years. This is approximately two-fifths the orbital period of Saturn, forming a near orbital resonance. The orbital plane of Jupiter is inclined 1.30° compared to Earth. Because the eccentricity of its orbit is 0.049, Jupiter is slightly over 75 million km nearer the Sun at perihelion than aphelion, which means that its orbit is nearly circular. This low eccentricity is at odds with exoplanet discoveries, which have revealed Jupiter-sized planets with very high eccentricities. Models suggest this may be due to there being only two giant planets in our Solar System, as the presence of a third or more giant planets tends to induce larger eccentricities.

The axial tilt of Jupiter is relatively small, only 3.13°, so its seasons are insignificant compared to those of Earth and Mars.

Jupiter's rotation is the fastest of all the Solar System's planets, completing a rotation on its axis in slightly less than ten hours; this creates an equatorial bulge easily seen through an amateur telescope. Because Jupiter is not a solid body, its upper atmosphere undergoes differential rotation. The rotation of Jupiter's polar atmosphere is about 5 minutes longer than that of the equatorial atmosphere. The planet is an oblate spheroid, meaning that the diameter across its equator is longer than the diameter measured between its poles. On Jupiter, the equatorial diameter is 9,276 km (5,764 mi) longer than the polar diameter.

Three systems are used as frames of reference for tracking planetary rotation, particularly when graphing the motion of atmospheric features. System I applies to latitudes from 7° N to 7° S; its period is the planet's shortest, at 9h 50 m 30.0s. System II applies at latitudes north and south of these; its period is 9h 55 m 40.6s. System III was defined by radio astronomers and corresponds to the rotation of the planet's magnetosphere; its period is Jupiter's official rotation.

Observation

Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon, and Venus), although at opposition Mars can appear brighter than Jupiter. Depending on Jupiter's position with respect to the Earth, it can vary in visual magnitude from as bright as −2.94 at opposition down to −1.66 during conjunction with the Sun. The mean apparent magnitude is −2.20 with a standard deviation of 0.33. The angular diameter of Jupiter likewise varies from 50.1 to 30.5 arc seconds. Favourable oppositions occur when Jupiter is passing through the perihelion of its orbit, bringing it closer to Earth. Near opposition, Jupiter will appear to go into retrograde motion for a period of about 121 days, moving backward through an angle of 9.9° before returning to prograde movement.

Because the orbit of Jupiter is outside that of Earth, the phase angle of Jupiter as viewed from Earth is always less than 11.5°; thus, Jupiter always appears nearly fully illuminated when viewed through Earth-based telescopes. It was only during spacecraft missions to Jupiter that crescent views of the planet were obtained. A small telescope will usually show Jupiter's four Galilean moons and the prominent cloud belts across Jupiter's atmosphere. A larger telescope with an aperture of 4-6 inches (10-15 cm) will show Jupiter's Great Red Spot when it faces Earth.

Pre-telescopic research

Model in the Almagest of the longitudinal motion of Jupiter (☉) relative to Earth (🜨)

Observation of Jupiter dates back to at least the Babylonian astronomers of the 7th or 8th century BC. The ancient Chinese knew Jupiter as the " Suì Star" ( Suìxīng ) and established their cycle of 12 earthly branches based on the approximate number of years it takes Jupiter to rotate around the Sun; the Chinese language still uses its name ( simplified as ) when referring to years of age. By the 4th century BC, these observations had developed into the Chinese zodiac, and each year became associated with a Tai Sui star and god controlling the region of the heavens opposite Jupiter's position in the night sky. These beliefs survive in some Taoist religious practices and in the East Asian zodiac's twelve animals. The Chinese historian Xi Zezong has claimed that Gan De, an ancient Chinese astronomer, reported a small star "in alliance" with the planet, which may indicate a sighting of one of Jupiter's moons with the unaided eye. If true, this would predate Galileo's discovery by nearly two millennia.

A 2016 paper reports that trapezoidal rule was used by Babylonians before 50 BC for integrating the velocity of Jupiter along the ecliptic. In his 2nd century work the , the Hellenistic astronomer Claudius Ptolemaeus constructed a geocentric planetary model based on deferents and epicycles to explain Jupiter's motion relative to Earth, giving its orbital period around Earth as 4332.38 days, or 11.86 years.

Ground-based telescope research

Galileo's drawings of Jupiter and its "Medicean Stars" from Sidereus Nuncius

In 1610, Italian polymath Galileo Galilei discovered the four largest moons of Jupiter (now known as the Galilean moons) using a telescope. This is thought to be the first telescopic observation of moons other than Earth's. Just one day after Galileo, Simon Marius independently discovered moons around Jupiter, though he did not publish his discovery in a book until 1614. It was Marius's names for the major moons, however, that stuck: Io, Europa, Ganymede, and Callisto. The discovery was a major point in favour of Copernicus' heliocentric theory of the motions of the planets; Galileo's outspoken support of the Copernican theory led to him being tried and condemned by the Inquisition.

In the autumn of 1639, the Neapolitan optician Francesco Fontana tested a 22-palm telescope of his own making and discovered the characteristic bands of the planet's atmosphere.

During the 1660s, Giovanni Cassini used a new telescope to discover spots in Jupiter's atmosphere, observe that the planet appeared oblate, and estimate its rotation period. In 1692, Cassini noticed that the atmosphere undergoes a differential rotation.

The Great Red Spot may have been observed as early as 1664 by Robert Hooke and in 1665 by Cassini, although this is disputed. The pharmacist Heinrich Schwabe produced the earliest known drawing to show details of the Great Red Spot in 1831. The Red Spot was reportedly lost from sight on several occasions between 1665 and 1708 before becoming quite conspicuous in 1878. It was recorded as fading again in 1883 and at the start of the 20th century.

Both Giovanni Borelli and Cassini made careful tables of the motions of Jupiter's moons, which allowed predictions of when the moons would pass before or behind the planet. By the 1670s, Cassini observed that when Jupiter was on the opposite side of the Sun from Earth, these events would occur about 17 minutes later than expected. Ole Rømer deduced that light does not travel instantaneously (a conclusion that Cassini had earlier rejected), and this timing discrepancy was used to estimate the speed of light.

In 1892, E. E. Barnard observed a fifth satellite of Jupiter with the 36-inch (910 mm) refractor at Lick Observatory in California. This moon was later named Amalthea. It was the last planetary moon to be discovered directly by a visual observer through a telescope. An additional eight satellites were discovered before the flyby of the Voyager 1 probe in 1979.

Jupiter viewed in infrared by JWST
(July 14, 2022)

In 1932, Rupert Wildt identified absorption bands of ammonia and methane in the spectra of Jupiter. Three long-lived anticyclonic features called "white ovals" were observed in 1938. For several decades they remained as separate features in the atmosphere, sometimes approaching each other but never merging. Finally, two of the ovals merged in 1998, then absorbed the third in 2000, becoming Oval BA.

Radiotelescope research

In 1955, Bernard Burke and Kenneth Franklin discovered that Jupiter emits bursts of radio waves at a frequency of 22.2 MHz. The period of these bursts matched the rotation of the planet, and they used this information to determine a more precise value for Jupiter's rotation rate. Radio bursts from Jupiter were found to come in two forms: long bursts (or L-bursts) lasting up to several seconds, and short bursts (or S-bursts) lasting less than a hundredth of a second.

Scientists have discovered three forms of radio signals transmitted from Jupiter:

Decametric radio bursts (with a wavelength of tens of metres) vary with the rotation of Jupiter, and are influenced by the interaction of Io with Jupiter's magnetic field.

Decimetric radio emission (with wavelengths measured in centimetres) was first observed by Frank Drake and Hein Hvatum in 1959. The origin of this signal is a torus-shaped belt around Jupiter's equator, which generates cyclotron radiation from electrons that are accelerated in Jupiter's magnetic field.

Thermal radiation is produced by heat in the atmosphere of Jupiter.

Exploration

Jupiter has been visited by automated spacecraft since 1973, when the space probe passed close enough to Jupiter to send back revelations about its properties and phenomena. Missions to Jupiter are accomplished at a cost in energy, which is described by the net change in velocity of the spacecraft, or delta-v. Entering a Hohmann transfer orbit from Earth to Jupiter from low Earth orbit requires a delta-v of 6.3 km/s, which is comparable to the 9.7 km/s delta-v needed to reach low Earth orbit. Gravity assists through planetary flybys can be used to reduce the energy required to reach Jupiter.

Flyby missions

Beginning in 1973, several spacecraft performed planetary flyby manoeuvres that brought them within observation range of Jupiter. The Pioneer missions obtained the first close-up images of Jupiter's atmosphere and several of its moons. They discovered that the radiation fields near the planet were much stronger than expected, but both spacecraft managed to survive in that environment. The trajectories of these spacecraft were used to refine the mass estimates of the Jovian system. Radio occultations by the planet resulted in better measurements of Jupiter's diameter and the amount of polar flattening.

Six years later, the Voyager missions vastly improved the understanding of the Galilean moons and discovered Jupiter's rings. They also confirmed that the Great Red Spot was anticyclonic. Comparison of images showed that the Spot had changed hues since the Pioneer missions, turning from orange to dark brown. A torus of ionized atoms was discovered along Io's orbital path, which were found to come from erupting volcanoes on the moon's surface. As the spacecraft passed behind the planet, it observed flashes of lightning in the night side atmosphere.

The next mission to encounter Jupiter was the solar probe. In February 1992, it performed a flyby manoeuvre to attain a polar orbit around the Sun. During this pass, the spacecraft studied Jupiter's magnetosphere, although it had no cameras to photograph the planet. The spacecraft passed by Jupiter six years later, this time at a much greater distance.

In 2000, the Cassini probe flew by Jupiter on its way to Saturn, and provided higher-resolution images.

The New Horizons probe flew by Jupiter in 2007 for a gravity assist en route to Pluto. The probe's cameras measured plasma output from volcanoes on Io and studied all four Galilean moons in detail.

Galileo in preparation for mating with the rocket, 1989

The first spacecraft to orbit Jupiter was the mission, which reached the planet on December 7, 1995. It remained in orbit for over seven years, conducting multiple flybys of all the Galilean moons and Amalthea. The spacecraft also witnessed the impact of Comet Shoemaker-Levy 9 when it collided with Jupiter in 1994. Some of the goals for the mission were thwarted due to a malfunction in Galileo' s high-gain antenna.

A 340-kilogram titanium atmospheric probe was released from the spacecraft in July 1995, entering Jupiter's atmosphere on December 7. It parachuted through 150 km (93 mi) of the atmosphere at a speed of about 2,575 km/h (1600 mph) and collected data for 57.6 minutes until the spacecraft was destroyed. The Galileo orbiter itself experienced a more rapid version of the same fate when it was deliberately steered into the planet on September 21, 2003. NASA destroyed the spacecraft to avoid any possibility of the spacecraft crashing into and possibly contaminating the moon Europa, which may harbour life.

Data from this mission revealed that hydrogen composes up to 90% of Jupiter's atmosphere. The recorded temperature was more than 300 °C (570 °F) and the windspeed measured more than 644 km/h (>400 mph) before the probes vaporized.

Juno preparing for testing in a rotation stand, 2011

NASA's mission arrived at Jupiter on July 4, 2016, with the goal of studying the planet in detail from a polar orbit. The spacecraft was originally intended to orbit Jupiter thirty-seven times over a period of twenty months. During the mission, the spacecraft will be exposed to high levels of radiation from Jupiter's magnetosphere, which may cause future failure of certain instruments. On August 27, 2016, the spacecraft completed its first fly-by of Jupiter and sent back the first-ever images of Jupiter's north pole.

Juno completed 12 orbits before the end of its budgeted mission plan, ending July 2018. In June of that year, NASA extended the mission operations plan to July 2021, and in January of that year the mission was extended to September 2025 with four lunar flybys: one of Ganymede, one of Europa, and two of Io. When Juno reaches the end of the mission, it will perform a controlled deorbit and disintegrate into Jupiter's atmosphere. This will avoid the risk of collision with Jupiter's moons.

Cancelled missions and future plans

There is great interest in missions to study Jupiter's larger icy moons, which may have subsurface liquid oceans. Funding difficulties have delayed progress, causing NASA's ( Jupiter Icy Moons Orbiter) to be cancelled in 2005. A subsequent proposal was developed for a joint NASA/ ESA mission called EJSM/Laplace, with a provisional launch date around 2020. EJSM/Laplace would have consisted of the NASA-led Jupiter Europa Orbiter and the ESA-led Jupiter Ganymede Orbiter. However, the ESA formally ended the partnership in April 2011, citing budget issues at NASA and the consequences on the mission timetable. Instead, ESA planned to go ahead with a European-only mission to compete in its L1 Cosmic Vision selection. These plans have been realized as the European Space Agency's Jupiter Icy Moon Explorer (JUICE), launched on April 14, 2023, followed by NASA's Europa Clipper mission, scheduled for launch in 2024.

Other proposed missions include the Chinese National Space Administration's mission which aims to launch an orbiter to the Jovian system and possibly Callisto around 2035, and CNSA's Interstellar Express and NASA's Interstellar Probe, which would both use Jupiter's gravity to help them reach the edges of the heliosphere.

Jupiter has 95 known natural satellites, and it is likely that this number would go up in the future due to improved instrumentation. Of these, 79 are less than 10 km in diameter. The four largest moons are Ganymede, Callisto, Io and Europa (in order of decreasing size), collectively known as the " Galilean moons", and are visible from Earth with binoculars on a clear night.

Galilean moons

The moons discovered by Galileo-Io, Europa, Ganymede, and Callisto-are among the largest in the Solar System. The orbits of Io, Europa, and Ganymede form a pattern known as a Laplace resonance; for every four orbits that Io makes around Jupiter, Europa makes exactly two orbits and Ganymede makes exactly one. This resonance causes the gravitational effects of the three large moons to distort their orbits into elliptical shapes, because each moon receives an extra tug from its neighbours at the same point in every orbit it makes. The tidal force from Jupiter, on the other hand, works to circularize their orbits.

The eccentricity of their orbits causes regular flexing of the three moons' shapes, with Jupiter's gravity stretching them out as they approach it and allowing them to spring back to more spherical shapes as they swing away. The friction created by this tidal flexing generates heat in the interior of the moons. This is seen most dramatically in the volcanic activity of Io (which is subject to the strongest tidal forces), and to a lesser degree in the geological youth of Europa's surface, which indicates recent resurfacing of the moon's exterior.

Name

IPA

Diameter

Mass

Orbital radius

Orbital period

km

D☾

kg

M☾

km

a☾

days

T☾

The Galilean satellites in false color. From left to right, in order of increasing distance from Jupiter: Io, Europa, Ganymede, Callisto.

The Galilean satellites Io, Europa, Ganymede, and Callisto (in order of increasing distance from Jupiter) in false color

Classification

Jupiter's moons were traditionally classified into four groups of four, based on their similar orbital elements. This picture has been complicated by the discovery of numerous small outer moons since 1999. Jupiter's moons are currently divided into several different groups, although there are several moons which are not part of any group.

The eight innermost regular moons, which have nearly circular orbits near the plane of Jupiter's equator, are thought to have formed alongside Jupiter, whilst the remainder are irregular moons and are thought to be captured asteroids or fragments of captured asteroids. The irregular moons within each group may have a common origin, perhaps as a larger moon or captured body that broke up.

Regular moons

These four moons, discovered by Galileo Galilei and by Simon Marius in parallel, orbit between 400,000 and 2,000,000 km, and are some of the largest moons in the Solar System.

Irregular moons

Himalia group

A tightly clustered group of prograde-orbiting moons with orbits around 11,000,000-12,000,000 km from Jupiter.

Ananke group

This group of retrograde-orbiting moons has rather indistinct borders, averaging 21,276,000 km from Jupiter with an average inclination of 149 degrees.

Interaction with the Solar System

As the most massive of the eight planets, the gravitational influence of Jupiter has helped shape the Solar System. With the exception of Mercury, the orbits of the system's planets lie closer to Jupiter's orbital plane than the Sun's equatorial plane. The Kirkwood gaps in the asteroid belt are mostly caused by Jupiter, and the planet may have been responsible for the purported Late Heavy Bombardment in the inner Solar System's history.

In addition to its moons, Jupiter's gravitational field controls numerous asteroids that have settled around the Lagrangian points that precede and follow the planet in its orbit around the Sun. These are known as the Trojan asteroids, and are divided into Greek and Trojan "camps" to honour the . The first of these, 588 Achilles, was discovered by Max Wolf in 1906; since then more than two thousand have been discovered. The largest is 624 Hektor.

The Jupiter family is defined as comets that have a semi-major axis smaller than Jupiter's; most short-period comets belong to this group. Members of the Jupiter family are thought to form in the Kuiper belt outside the orbit of Neptune. During close encounters with Jupiter, they are perturbed into orbits with a smaller period, which then becomes circularized by regular gravitational interactions with the Sun and Jupiter.

Brown spots mark Comet Shoemaker-Levy 9's impact sites on Jupiter

Jupiter has been called the Solar System's vacuum cleaner because of its immense gravity well and location near the inner Solar System. There are more impacts on Jupiter, such as comets, than on any other planet in the Solar System. For example, Jupiter experiences about 200 times more asteroid and comet impacts than Earth. In the past, scientists believed that Jupiter partially shielded the inner system from cometary bombardment. However, computer simulations in 2008 suggest that Jupiter does not cause a net decrease in the number of comets that pass through the inner Solar System, as its gravity perturbs their orbits inward roughly as often as it accretes or ejects them. This topic remains controversial among scientists, as some think it draws comets towards Earth from the Kuiper belt, while others believe that Jupiter protects Earth from the Oort cloud.

In July 1994, the Comet Shoemaker-Levy 9 comet collided with Jupiter. The impacts were closely observed by observatories around the world, including the Hubble Space Telescope and Galileo spacecraft. The event was widely covered by the media.

Surveys of early astronomical records and drawings produced eight examples of potential impact observations between 1664 and 1839. However, a 1997 review determined that these observations had little or no possibility of being the results of impacts. Further investigation by this team revealed a dark surface feature discovered by astronomer Giovanni Cassini in 1690 may have been an impact scar.

Jupiter, woodcut from a 1550 edition of Guido Bonatti's Liber Astronomiae

The existence of the planet Jupiter has been known since ancient times. It is visible to the naked eye in the night sky and can occasionally be seen in the daytime when the Sun is low. To the Babylonians, this planet represented their god Marduk, chief of their pantheon from the Hammurabi period. They used Jupiter's roughly 12-year orbit along the ecliptic to define the constellations of their zodiac.

The mythical Greek name for this planet is (Ζεύς), also referred to as Dias (Δίας), the planetary name of which is retained in modern Greek. The ancient Greeks knew the planet as Phaethon (), meaning "shining one" or "blazing star". The Greek myths of Zeus from the Homeric period showed particular similarities to certain Near-Eastern gods, including the Semitic El and Baal, the Sumerian Enlil, and the Babylonian god Marduk. The association between the planet and the Greek deity Zeus was drawn from Near Eastern influences and was fully established by the fourth century BC, as documented in the of Plato and his contemporaries.

The god Jupiter is the Roman counterpart of Zeus, and he is the principal god of Roman mythology. The Romans originally called Jupiter the "star of Jupiter" ( Iuppiter Stella), as they believed it to be sacred to its namesake god. This name comes from the Proto-Indo-European vocative compound * Dyēu-pəter (nominative: *Dyēus-pətēr, meaning "Father Sky-God", or "Father Day-God"). As the supreme god of the Roman pantheon, Jupiter was the god of thunder, lightning, and storms, and was called the god of light and sky.

In Vedic astrology, Hindu astrologers named the planet after Brihaspati, the religious teacher of the gods, and often called it " Guru", which means the "Teacher". In Central Asian Turkic myths, Jupiter is called Erendiz or Erentüz, from eren (of uncertain meaning) and yultuz ("star"). The Turks calculated the period of the orbit of Jupiter as 11 years and 300 days. They believed that some social and natural events connected to Erentüz's movements in the sky. The Chinese, Vietnamese, Koreans, and Japanese called it the "wood star" ( Chinese: 木星; pinyin: ), based on the Chinese Five Elements. In China, it became known as the "Year-star" (Sui-sing), as Chinese astronomers noted that it jumped one zodiac constellation each year (with corrections). In some ancient Chinese writings, the years were, in principle, named in correlation with the Jovian zodiac signs.

Infrared view of Jupiter, imaged by the Gemini North telescope in Hawaiʻi, January 11, 2017. False color added.

Jupiter imaged in visible light by the Hubble Space Telescope, January 11, 2017. Colors and contrasts are extremely enhanced.

Ultraviolet view of Jupiter by Hubble, January 11, 2017.[248] False colored image.

Jupiter and Europa, taken by Hubble on 25 August 2020, when the planet was 653 million kilometres from Earth. False color image.[249]

Infrared photo by James Webb Space Telescope, August 2022. False color image.[250]

References

External links

Lohninger, Hans; et al. (November 2, 2005). "Jupiter, As Seen By Voyager 1". A Trip into Space. Virtual Institute of Applied Science.

Dunn, Tony (2006). "The Jovian System". Gravity Simulator. - A simulation of the 62 moons of Jupiter.

Jupiter in Motion - album of Juno imagery stitched into short videos (on Flickr)

June 2010 impact video on YouTube

Photographs of Jupiter circa 1920s from the Lick Observatory Records Digital Archive, UC Santa Cruz Library's Digital Collections. Archived September 4, 2015, at the Wayback Machine.

Interactive 3D gravity simulation of the Jovian system. Archived June 11, 2020, at the Wayback Machine.

Video (animation; 4:00): Flyby of Ganymede and Jupiter (NASA; 15 July 2021).

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Strange shadows pass Jupiter searching for rare groups.

http://www.skyandtelescope.com/observing/dont-miss-jupiters-shadow-trifecta/

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Public creation image of jupiter made of words about it.

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Gustav Holst - The Planets - Jupiter, the Bringer of Jollity(Song)

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Gustav Holst - The Planets - Jupiter, the Bringer of Jollity(Song)

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https://www.youtube.com/watch?v=Nz0b4STz1lo

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April 12, 2015. How jupiter survived. Scientists say jupiter is very close to becoming a star and may have found out how it survived.

Read more:

http://www.space.com/28991-gas-giant-planets-migration-mystery.html

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In 1610, Galileo Galilei turned his telescope onto Jupiter. He after realized that he realized it had 4 large moons orbiting it.

http://www.universetoday.com/15142/discovery-of-jupiter/

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Without a telescope or powerful binoculars it looks like a red dot, as big as a large star. With technological assistance you can see a red and baige color sphere with wavy detail, if your telescope is strong enough.

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Jupiter's Atmosphere: Overview of Cloud Shapes, Location, Composition - Windows to the Universe

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Windows to the Universe, at http://windows2universe.org/ from the National Earth Science Teachers Association (NESTA). The Website was developed in part with the support of UCAR and NCAR, where it resided from 2000 - 2010. © 2012 National Earth Science Teachers Association. Windows to the Universe® is a registered trademark of NESTA.

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818 million kilometres

http://www.space.com/18383-how-far-away-is-jupiter.html

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740 million kilometres

http://www.space.com/18383-how-far-away-is-jupiter.html

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Jupiter (or Jove, but known as Zeus to the Greeks)

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Jupiter (or Jove, but known as Zeus to the Greeks)

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He overthrew his Father Saturn (in Greek, Cronus). He then drew lots with his brothers Poseidon and Hades to determine who would be the supreme ruler of the gods.

http://bulte.web.cern.ch/bulte/myth_jupiter_moon.html

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Jupiter's name comes from the roman version of Zeus because of early astronomers realizing its immense size.

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Solar System Jupiter Poem About the Great Jupiter 

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Solar System Jupiter Poem About the Great Jupiter 

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5th grader made poem about jupiter.

http://sciencepoems.net/sciencepoems/jupiter.aspx#.VTaOYRZ0Fjg

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https://www.youtube.com/watch?v=7Xf-Lesrkuc

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Jupiter has 23.13ms-2 surface gravity 2.36 times stronger than Earth.

Google supplied answer