Sun Our solar system's star. It is a main-sequence G dwarf star. Mercury The planet closest to the Sun, and is the second-smallest of the nine major planets. Venus The second planet from the Sun. It is similar in size to the Earth, and has no moons. Earth Our planet, the third from the Sun. Mars The fourth planet from the Sun. It is smaller than the Earth, and has a thin atmosphere, as well as two small moons. Jupiter The fifth planet from the Sun, and the largest planet in the solar system. Jupiter is a gas giant, and has dozens of moons. Saturn The sixth planet from the Sun. Saturn is a gas giant and has dozens of moons. It also has a beautiful ring system. Uranus The seventh planet from the Sun. Uranus is a small gas giant with a tenuous ring system. Neptune The eighth planet from the Sun. Uranus is a small gas giant. It was the first planet to be discovered in modern times. Pluto The furthest major planet from the Sun, and also the smallest. Very few details are known about this distant, icy world. It has a moon which is not much smaller than Pluto itself.