Across
- 3. a ______ system is made up of a star and moving objects
- 4. a _____ planet hasn't cleared its own orbit
- 5. a layer of gas
- 8. a planet is known as a planet if it clears its own _____
Down
- 1. all of space and everything in it
- 2. a collection of billions of stars
- 6. a large ball of gas that gives of heat
- 7. the number of planets in our solar system