The document describes the planets in our solar system. It explains that there are 8 officially recognized planets orbiting our sun, plus dwarf planets like Pluto. Each planet is introduced with details about its composition, number of moons, and time it takes to complete an orbit around the sun. The largest planets are gas giants like Jupiter and Saturn, while smaller planets like Earth and Mars are composed of rock. The solar system resides within the Milky Way galaxy, which contains billions of other stars.