Across
- 1. Bright objects in the night sky
- 6. A device Stephen Hawking used to move
- 8. A scientist who studies matter and energy
- 9. Another word for the universe
- 10. The study of the natural world
Down
- 2. What clocks measure
- 3. A system of stars and planets
- 4. The force that pulls objects together
- 5. A region of space with strong gravity
- 7. Everything that exists in space