Across
- 4. a planet's spin on its axis
- 6. everything in space
- 8. a person who studies space
- 10. a device used to make distant objects appear closer
- 12. a imaginary line going though the sphere's north and south poles
Down
- 1. the theory that the sun is in the middle of the solar system
- 2. the study of space
- 3. a on the surface of a planet or moon caused by a rock form space hitting the surface
- 5. the theory that the earth was once in the middle of the solar system
- 7. when a object travels around another
- 9. the force that pulls an object toward the center of a planet or moon
- 11. when an object spins around another object in space