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These sources are more challenging and provide more information!

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These sources are more challenging and provide more information!

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Mercury is the closest planet to the sun, so it takes a lot of solar heat! Take a (very) warm and wonderful voyage with Tim and Moby to find out more.

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From the oceans to the valleys, to the landforms, that we love! Tim and Moby talk about our blue, blue planet and its delicate atmosphere.

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Everything’s bigger on Jupiter—from the size of the storms to the pull of gravity itself! Learn more about the largest planet in the solar system.

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Neptune is dark, cold, and very windy. It's the last of the planets in our solar system. It's more than 30 times as far from the sun as Earth is. Neptune is very similar to Uranus. It's made of a thick fog of water, ammonia, and methane over an Earth-sized solid center. Its atmosphere is made of hydrogen, helium, and methane. The methane gives Neptune the same blue color as Uranus. Neptune has six rings, but they're very hard to see.

Structure and Surface

Neptune is encircled by six rings.

Neptune, like Uranus, is an ice giant. It's similar to a gas giant. It is made of a thick soup of water, ammonia, and methane flowing over a solid core about the size of Earth.

Neptune has a thick, windy atmosphere.

Time on Neptune

One day on Neptune goes by in 16 hours.

Neptune has such a long journey around the Sun it takes 165 Earth years to go around once. That's a long year!

Neptune's Neighbors

Neptune has 14 moons.

Neptune is the eighth and most distant planet from the Sun. That means Uranus is Neptune's only neighboring planet.

Quick History

Neptune was discovered in 1846 by Urbain Le Verrier, John Couch Adams, and Johann Galle.

Only Voyager 2 has visited Neptune.

What does Neptune look like?

For more information visit:
NASA Solar System Exploration

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Enter the Access ID and Passcode provided by your school to access Britannica School.

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Enter the Access ID and Passcode provided by your school to access Britannica School.

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Welcome to Britannica School , a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.

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Welcome to Britannica School , a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.

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Welcome to Britannica School , a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.

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Enter the Access ID and Passcode provided by your school to access Britannica School.

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Enter the Access ID and Passcode provided by your school to access Britannica School.

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Welcome to Britannica School , a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.

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Enter the Access ID and Passcode provided by your school to access Britannica School.

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Bienvenido a Britannica Escolar , un recurso informativo para la educación primaria y secundaria que es seguro, actualizado y apropiado para cada nivel educativo.

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Categoría de Ciencia: El Espacio - BrainPOP Español

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Aprende sobre el espacio junto con Tim y Moby con estas películas BrainPOP.

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Uranus is made of water, methane, and ammonia fluids above a small rocky center. Its atmosphere is made of hydrogen and helium like Jupiter and Saturn, but it also has methane. The methane makes Uranus blue.

Uranus also has faint rings. The inner rings are narrow and dark. The outer rings are brightly colored and easier to see. Like Venus, Uranus rotates in the opposite direction as most other planets. And unlike any other planet, Uranus rotates on its side.

Structure and Surface

Uranus is surrounded by a set of 13 rings.

Uranus is an ice giant (instead of a gas giant). It is mostly made of flowing icy materials above a solid core.

Uranus has a thick atmosphere made of methane, hydrogen, and helium.

Uranus is the only planet that spins on its side.

Uranus spins the opposite direction as Earth and most other planets.

Time on Uranus

One day on Uranus lasts a little over 17 hours (17 hours and 14 minutes, to be exact).

One year on Uranus is the same as 84 years on Earth. That's a long time to wait for a birthday cake.

Uranus' Neighbors

Uranus has 27 known moons.

Uranus is the seventh planet from the Sun. That means Saturn and Neptune are Uranus' neighboring planets.

Quick History

Uranus was discovered in 1781 by William Herschel in Great Britain.

Uranus has only been visited by Voyager 2.

What does Uranus look like?

For more information visit:
NASA Solar System Exploration

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Jupiter is the biggest planet in our solar system. It's similar to a star, but it never got massive enough to start burning. It is covered in swirling cloud stripes. It has big storms like the Great Red Spot, which has been going for hundreds of years. Jupiter is a gas giant and doesn't have a solid surface, but it may have a solid inner core about the size of Earth. Jupiter also has rings, but they're too faint to see very well.

Structure and Surface

Jupiter is the biggest planet in our solar system.

Jupiter is a gas giant. It is made mostly of hydrogen and helium.

Jupiter has a very thick atmosphere.

Jupiter has rings, but they're very hard to see.

Time on Jupiter

One day on Jupiter goes by in just 10 hours.

One year on Jupiter is the same as 11.8 Earth years.

Jupiter's Neighbors

Jupiter has 80 confirmed moons.

Jupiter is the fifth planet from the Sun. That means Mars and Saturn are Jupiter's neighboring planets.

Quick History

Jupiter has been known since ancient times because it can be seen without advanced telescopes.

Jupiter has been visited or passed by several spacecraft, orbiters and probes, such as Pioneer 10 and 11, Voyager 1 and 2, Cassini, New Horizons, and Juno.

What does Jupiter look like?

For more information visit:
NASA Solar System Exploration

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All About Mars | NASA Space Place – NASA Science for Kids

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Our home planet Earth is a rocky, terrestrial planet. It has a solid and active surface with mountains, valleys, canyons, plains and so much more. Earth is special because it is an ocean planet. Water covers 70% of Earth's surface.

Our atmosphere is made mostly of nitrogen and has plenty of oxygen for us to breathe. The atmosphere also protects us from incoming meteoroids, most of which break up in our atmosphere before they can strike the surface as meteorites.

Since we live here, you might think we know all there is to know about Earth. Not at all, actually! We have a lot we can learn about our home planet. Right now, there are many satellites orbiting Earth taking pictures and measurements. This is how we can learn more about weather, oceans, soil, climate change, and many other important topics.

Structure and Surface

Earth is a terrestrial planet. It is small and rocky.

Earth's atmosphere is the right thickness to keep the planet warm so living things like us can be there. It's the only planet in our solar system we know of that supports life. It is mostly nitrogen, and it has plenty of oxygen for us to breathe.

Time on Earth

A day on Earth lasts a little under 24 hours.

One year on Earth lasts 365.25 days. That 0.25 extra means every four years we need to add one day to our calendar. We call it a leap day (in a leap year).

Earth's Neighbors

Earth has just one Moon. It is the only planet to have just one moon.

Earth has lots of spacecraft watching it. There is still a lot we can learn about our home planet.

Earth is the third planet from the Sun in our solar system. That means Venus and Mars are Earth's neighboring planets.

Quick History

We have known about our planet since ancient times, of course. But we didn't know our place in the solar system for a long time.

What does Earth look like?

For more information visit:
NASA Solar System Exploration

Related Resources for Educators

Real World: A-Train
Our World: A-Train
Real World: Earth Systems

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Even though Venus isn't the closest planet to the Sun, it is still the hottest. It has a thick atmosphere full of the greenhouse gas carbon dioxide and clouds made of sulfuric acid. The gas traps heat and keeps Venus toasty warm. In fact, it's so hot on Venus, metals like lead would be puddles of melted liquid.

Venus looks like a very active planet. It has mountains and volcanoes. Venus is similar in size to Earth. Earth is just a little bit bigger.

Venus is unusual because it spins the opposite direction of Earth and most other planets. And its rotation is very slow. It takes about 243 Earth days to spin around just once. Because it's so close to the Sun, a year goes by fast. It takes 225 Earth days for Venus to go all the way around the Sun. That means that a day on Venus is a little longer than a year on Venus.

Since the day and year lengths are similar, one day on Venus is not like a day on Earth. Here, the Sun rises and sets once each day. But on Venus, the Sun rises every 117 Earth days. That means the Sun rises two times during each year on Venus, even though it is still the same day on Venus! And because Venus rotates backwards, the Sun rises in the west and sets in the east.

Just like Mercury, Venus doesn't have any moons.

Structure and Surface

Venus is the hottest planet in our solar system.

Venus is a terrestrial planet. It is small and rocky.

Venus has a thick atmosphere. It traps heat and makes Venus very hot.

Venus has an active surface, including volcanoes!

Venus spins the opposite direction of Earth and most other planets.

Time on Venus

A day on Venus lasts 243 Earth days.

A year on Venus lasts 225 Earth days.

Venus's Neighbors

Venus does not have any moons.

Venus is the second planet from the Sun. That means Mercury and Earth are Venus's neighboring planets.

Quick History

Venus has been known since ancient times because it can be seen easily without a telescope.

Venus has been visited by several spacecraft: Mariner 2, Mariner 5, Mariner 10, Pioneer Venus 1, Pioneer Venus 2, and an orbiter called Magellan.

What does Venus look like?

For more information visit:
NASA Solar System Exploration

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Mercury is the smallest planet in our solar system. It's just a little bigger than Earth's moon. It is the closest planet to the sun, but it's actually not the hottest. Venus is hotter.

Along with Venus, Earth, and Mars, Mercury is one of the rocky planets. It has a solid surface that is covered with craters. It has no atmosphere, and it doesn't have any moons. Mercury likes to keep things simple.

This small planet spins around slowly compared to Earth, so one day lasts a long time. Mercury takes 59 Earth days to make one full rotation. A year on Mercury goes by fast. Because it's the closest planet to the sun, it doesn't take very long to go all the way around. It completes one revolution around the sun in just 88 Earth days. If you lived on Mercury, you'd have a birthday every three months!

A day on Mercury is not like a day here on Earth. For us, the sun rises and sets each and every day. Because Mercury has a slow spin and short year, it takes a long time for the sun to rise and set there. Mercury only has one sunrise every 180 Earth days! Isn't that weird?

Structure and Surface

Mercury is the smallest planet in our solar system.

Mercury is a terrestrial planet. It is small and rocky.

Mercury doesn't really have an atmosphere.

Time on Mercury

A day on Mercury lasts 59 Earth days.

A year on Mercury lasts 88 Earth days.

Mercury's Neighbors

Mercury does not have any moons.

Mercury is the closest planet to the sun.

Venus is Mercury's neighboring planet.

Quick History

Mercury has been known since ancient times because it can be seen without advanced telescopes.

Mercury has been visited by two spacecraft: Mariner 10 and MESSENGER.

What does Mercury look like?

For more information visit:
NASA Solar System Exploration

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Solar System | NASA Space Place - NASA Science for Kids

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Articles, games and activities about our planetary neighbors