Across
- 4. planets move in _______ orbits
- 6. pieces of rock floating through space
- 7. earth at the center of the universe
- 9. this scientist developed a model of a geocentric universe
- 10. made of ice, rock, and gas
Down
- 1. another name for moons
- 2. these planets cannot clear their own debris
- 3. sun at the center of the universe
- 5. believed to be remains from the creation of the universe
- 8. planets move in cyclic paths called