Across
- 2. A celestial body that orbits around a star,
- 3. planets move in elliptical orbits
- 4. The amount of matter in an object
- 6. Sun is the center of the universe
- 8. the Earth is the center of the universe
- 10. force of attraction between two objects
Down
- 1. collection of planets and other solar objects
- 5. energy from the sun
- 7. imaginary line around which a celestial body rotates
- 9. space, time, matter, and energy