The document discusses the nine planets that make up our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. It notes that Saturn and Uranus have rings and that the Sun is the source of energy for the solar system. Earth is the only planet that supports life. Mercury is the closest planet to the Sun so it is very hot, while Pluto is the farthest and coldest planet. Jupiter is the largest planet in the solar system and Pluto is the smallest.