This FREE 20 question science test covers how our solar system works, covering key concepts such as orbit, rotation, and gravity. It also tests student knowledge about each of the 8 planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune (plus the dwarf planet Pluto). It also includes an answer key. Note: This free resource is part of a 10 lesson world biomes unit. Feel free to use the assessment on its own, or purchase the unit bundle to access all of th