The document describes the 8 planets in our solar system: Mercury is the closest planet to the sun and has no moons. Venus is similar to Earth. Earth is our planet and has day/night cycles and one moon. Mars is known as the red planet and has two moons. Jupiter is the largest planet and is made of gas. Saturn has rings made of rocks and many moons. Uranus is the third largest planet with 27 moons and an 84 year orbit. Neptune is the farthest planet, coldest, with 13 moons and a 164 year orbit.