Across
- 3. a person who studies space
- 7. a device to make far away object look close
- 8. a hole on the surface of a planet or moon
- 11. An imaginary line going through the center of a sphere
- 12. when a planet spins on its axis
Down
- 1. the study of space
- 2. A theory that earth is the center of the universe
- 4. the path of an object when it object spins around another object in space
- 5. when an object spins around another object in space
- 6. A theory that the sun is the center of the solar system
- 9. everything in space
- 10. a force that pull things to the center of a planet or star