Across
- 3. a theory that the Earth is the center of the universe
- 5. a device to make far things appear much closer
- 6. a person who studies space
- 7. everything in space as a whole
- 10. the study of space beyond our atmosphere
- 11. the path of another object around another object in space
Down
- 1. a theory that says the sun is the center of the solar system
- 2. a hole in a planet or moon caused by a rock from space hitting it
- 4. when an object travels around another object
- 6. an imaginary line that goes through the north and south poles
- 8. a planet's spin on its axis
- 9. a force that pulls things towards the center of the Earth