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The Solar System is a vast and mysterious region filled with knowledge that today’s greatest minds have yet to witness. The solar system formed about 4.500 billion years ago. The solar system formed by a great gravitational collapse of a large molecular cloud. The solar system consists of the Sun and the orbiting planets, asteroids, comets, planets, and moons around it. The largest of all the orbiting objects in the solar system are the eight planets. The most mass in the solar system is from the Sun, while most of the remaining mass comes from Jupiter. The inner planets are Venus, Mercury, Mars, and Earth. These planets are also called terrestrial planets. The four outer planets are called gas giants because they are mostly comprised of gas and vapor. These planets are Jupiter, Saturn, Uranus, and Neptune. All planets mostly have a circular orbit that lie in the ecliptic plane.
The solar system contains much smaller objects that orbit the Sun as well. The asteroid belt contains of rock and metal. The asteroid belt lies between Mars and Jupiter. The Kuiper belt lies beyond Neptune, which is comprised of mostly gas. Beyond this are objects that might have been rounded out by their own gravity. These objects are known as dwarf planets. Known dwarf planets include an asteroid called Ceres, Pluto, and Eris. Other than these regions, there are smaller objects such as comets, centaurs, and interplanetary dust. Six of the planets are orbited by natural satellites that are commonly referred to as “moons”. Each of the outer planets has rings of dust and small objects.
For thousands of years, it is notable that no one even knew that there was a solar system. People believed that the Earth was the center of universe and that everything beyon...

... middle of paper ... made of mostly ice and rock. Saturn has sixty-two known moons. Two of these moons, Titan and Enceladus, are known to have geological activity, although it consists of mainly ice.
Uranus is the seventh planet from the sun. This planet is considered the lightest of all the outer planets. Unlike all the other planets, it orbits the sun on its side. It has a much colder core than all the other gas giants. It has 27 known moons, the largest of which are Titanic, Oberon, Umbriel, Ariel, and Miranda.
Neptune is the eighth planet from the sun. Neptune is considered to be denser than Uranus, but oddly enough is more massive. It has 14 known moons. The largest of them, Triton, is geologically active, comprised of liquid nitrogen. It is the only moon with a retrograde orbit. Neptune is also sharing orbit with several smaller planets, which have been termed, Neptune Trojans.

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