By Seymour Simon
Describes the origins, features, and way forward for the solar, planets, moons, asteroids, meteoroids, and comets.
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A young The planet remained undiscovered for many years because it is so far from Earth and less than two-thirds the size of Earth's moon. Pluto was named after the Greek and Roman god of the underworld. The smallest and coldest planet in the Solar System, Pluto appears to be an ice ball of methane and water mixed with rock, surrounded methane gas. Scientists are a Neptunian moon knocked still by a thin atmosphere of not sure whether Pluto is out of orbit long ago or an asteroid that strayed into a distant orbit around the sun.
Moons of any planet in the Solar More than twenty have been discovered, and there are probably others. Saturn has one large that are medium-sized, moon, six and at least fourteen smaller ones. Most of Saturn's moons are ice-covered and pockmarked with craters. This picture of Saturn and some of its moons was made from a number of photographs taken by Voyager. Saturn is partly hidden by Dione. Enceladus and Rhea are off in the distance to the upper left. Tethys and Mimas are off to the lower right.
Years after its discovery by William Herschel through a telescope in 1781, the planet was named Uranus, after the Greek god of heaven and ruler of the world. Uranus is a ringed planet made up mostly of gases, about halfway in between size Uranus were hollow, about Jupiter and Earth. If planet Earths could fit fifty inside. In January 1986, eight and a half years after it had been launched from Earth, the Voyager 2 spacecraft swept past the pale blue-green clouds of Uranus. This photograph of Uranus was taken when Voyager was still five million miles from the planet.
Our Solar System by Seymour Simon