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There are more planets than stars in our galaxy. The current count orbiting our star: eight.

The inner, rocky planets are Mercury, Venus, Earth, and Mars. NASA's newest rover — Perseverance — landed on Mars on Feb. 18, 2021. The outer planets are gas giants Jupiter and Saturn and ice giants Uranus and Neptune.

Beyond Neptune, a newer class of smaller worlds called dwarf planets reign, including longtime favorite Pluto. Thousands more planets have been discovered beyond our solar system. Scientists call them exoplanets (exo means "from outside").

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Our Sun is one of at least 100 billion stars in the Milky Way, a spiral galaxy about 100,000 light-years across.

The stars are arranged in a pinwheel pattern with four major arms, and we live in one of them, about two-thirds of the way outward from the center.

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Neptune known as the Kuiper Belt, icy Pluto was reclassified as a dwarf planet.

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Pluto is a complex and mysterious world with mountains, valleys, plains, craters, and apparently even glaciers.

Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery that many similar, intriguing worlds inhabit the distant region beyond Neptune.

Although Pluto isn’t considered a planet anymore because it hasn’t cleared the neighborhood around its orbit of other objects.

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solarsystem.nasa.gov

https://www.bbc.com/news/science-environment-33462184

https://getwallpapers.com/collection/solar-system-wallpaper

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The planet Jupiter’s four largest moons, or satellites, are called the Galilean moons, after Italian astronomer Galileo Galilei, who observed them in 1610. The German astronomer Simon Marius apparently discovered them around the same time. The names Marius proposed for the moons in 1614 (suggested to him by a fellow astronomer, Johannes Kepler) are the ones we use today — Io, Europa, Ganymede, and Callisto.

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Earth's Moon is the only place beyond Earth where humans have set foot, so far

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The brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate. It also causes tides, creating a rhythm that has guided humans for thousands of years.

The Moon was likely formed after a Mars-sized body collided with Earth several billion years ago.

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Jupiter's rocky moon Io is the most volcanically active world in the solar system, with hundreds of volcanoes, some erupting lava fountains dozens of miles (or kilometers) high.

In mythology, Io is a mortal woman transformed into a cow during a dispute between the Greek god Zeus – Jupiter in Roman mythology – and his wife, Hera – Juno to the Romans.

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Ceres is named for the Roman goddess of agriculture. The word "cereal" comes from the same origin.

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Ceres is the largest object in the asteroid belt between Mars and Jupiter.

In fact, it makes up 30 percent of the asteroid belt's total mass. Ceres is heavily cratered, with no atmosphere, and large amounts of ice underground mixed with rock and salt. It also has a huge volcano that likely once erupted with salt and mud, and a crater with prominent bright, salty deposits-suggesting the icy subsurface has erupted in the past and could still be active.

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The Sun has many names in many cultures. The Latin word for Sun is “sol,” which is the main adjective for all things Sun-related: solar

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The Sun is a yellow dwarf star, a hot ball of glowing gases at the heart of our solar system.

Its gravity holds the solar system together, keeping everything – from the biggest planets to the smallest particles of debris – in its orbit. The connection and interactions between the Sun and Earth drive the seasons, ocean currents, weather, climate, radiation belts and auroras. Though it is special to us, there are billions of stars like our Sun scattered across the Milky Way galaxy.

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Ganymede is named for a boy who was made cupbearer for the ancient Greek gods by Zeus – Jupiter to the Romans

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Ganymede is the largest moon in our solar system and the only moon with its own magnetic field. The magnetic field causes auroras, which are ribbons of glowing, electrified gas, in regions circling the moon’s north and south poles. Ganymede has large, bright regions of ridges and grooves that slice across older, darker terrains. These grooved regions are a clue that the moon experienced dramatic upheavals in the distant past. Scientists have also found strong evidence of an underground ocean on Ganymede.

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ASTEROIDS are giant hunks of rock and metal that orbit the Sun. Some are more rocky in composition, while others are more metallic. Like comets, they are remnants left over from the formation of our solar system more than 4 billion years ago. Most of this ancient space rubble can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt. Many asteroids have orbits that stray far outside the asteroid belt as well, and quite a few have paths that cross the orbit of Earth. Groups of asteroids have collected in different parts of the solar system over time as a result of gravitational tugs from Jupiter and the other planets

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Callisto is named for a woman turned into a bear by Zeus in Greek mythology – Jupiter to the Romans

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Callisto is the third largest moon in our solar system and is almost the size of Mercury. It is the outermost of the four large Galilean satellites. Callisto is the most heavily cratered object in our solar system. It is thought to be a long-dead world, with hardly any geologic activity on its surface — with a surface age of about 4 billion years, Callisto has the oldest landscape in the solar system. Like Ganymede and Europa, Callisto also shows strong evidence of an ocean deep under its icy surface.

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Enceladus is named after a giant in Greek mythology.

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An icy ocean moon of Saturn-is one of our solar system's most compelling worlds. A handful of worlds are thought to have liquid water oceans beneath their frozen shell, but Enceladus sprays its ocean out into space where a spacecraft can sample it. From these samples, scientists have determined that Enceladus has most of the chemical ingredients needed for life, and likely has hydrothermal vents spewing out hot, mineral-rich water into its ocean.

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Saturn's largest moon, Titan, is the second largest moon in our solar system—Jupiter's Ganymede is only 2 percent larger.

Titan is the only moon in our solar system that has clouds and a dense atmosphere, mostly made of nitrogen and methane. It is also the only other place in the solar system known to have an earthlike cycle of liquids evaporating, raining and flowing across its surface.

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Saturn is the sixth planet from the Sun and the second-largest planet in our solar system.

Like fellow gas giant Jupiter, Saturn is a massive ball made mostly of hydrogen and helium.

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Europa is named for a woman abducted by the god Zeus in Greek mythology–Jupiter to the Romans.

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Slightly smaller than Earth's Moon, Europa’s water-ice surface is crisscrossed by long, linear fractures. Like our planet, Europa is thought to have an iron core, a rocky mantle, and an ocean of salty water. Unlike Earth, however, Europa’s ocean lies below a shell of ice probably 10 to 15 miles (15 to 25 kilometers) thick and has an estimated depth of 40 to 100 miles (60 to 150 kilometers).

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Comets are icy cosmic dirt balls – mountains of dust, ice and frozen gases that orbit the Sun. Like asteroids, they are remnants left over from the formation of our solar system more than 4 billion years ago.

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Neptune—the eighth and most distant major planet orbiting our Sun—is dark, cold and whipped by supersonic winds.
It was the first planet located through mathematical calculations.

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Earth is the fifth largest planet, and the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.

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Uranus is the seventh planet from the Sun, and has the third-largest diameter in our solar system. It was the first planet found with the aid of a telescope.
Uranus was discovered in 1781 by astronomer William Herschel, although he originally thought it was either a comet or a star.

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A dusty, cold, desert world with a very thin atmosphere. There is strong evidence Mars was – billions of years ago – wetter and warmer, with a thicker atmosphere.

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Our solar system is a planetary system composed of our star, the Sun, and all the objects that orbit around it — eight large planets, many smaller, planet-like worlds, dozens of moons, and millions of asteroids, comets and meteoroids. The planetary system we call home is located in an outer spiral arm of the vast Milky Way galaxy.

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Venus spins slowly in the opposite direction from most planets. A thick atmosphere traps heat in a runaway greenhouse effect, making it the hottest planet in our solar system.

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Jupiter is more than twice as massive than the other planets of our solar system combined. The giant planet's Great Red spot is a centuries-old storm bigger than Earth.

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Mercury is the smallest planet in our solar system and closest to the Sun—is only slightly larger than Earth's Moon. Mercury is the fastest planet, zipping around the Sun every 88 Earth days.