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Solar System: An Overview Introduction The Solar System is the Sun and all the objects that orbit it, including planets, moons, asteroids, comets, and meteoroids. It is located in the Milky Way Galaxy and is estimated to be about 4.6 billion years old. The Sun is the largest object in the Solar System, accounting for more than 99 percent of the system’s mass. The four inner planets, Mercury, Venus, Earth, and Mars, are small and rocky, and their orbits are closer to the Sun. The four outer planets, Jupiter, Saturn, Uranus, and Neptune, are much larger and made mostly of gases. The Solar System is the home of our planet, Earth. It is composed of the Sun and all the objects that orbit it. This includes the eight planets and their moons, dwarf planets, asteroids, comets, dust, and...