Mercury, Venus, Earth and Mars make up the inner planets in our solar system. Jupiter, Saturn, Uranus, and Neptune make up the outer planets. Use this collection of lesson plans, worksheets, videos, and presentations to build young astronomers' knowledge of the eight planets that orbit the sun. Pair with your unit on the solar system, or use in conjunction with the reading comprehension collection titled How Do You Organize a Space Party? You Planet! (Reading Comprehension).