Across
- 2. symbol h
- 5. small particles that made up the universe
- 8. universal force of attraction
- 9. Made up of all matter in space
Down
- 1. mass slightly greater than a proton
- 3. negatively charged particles of an atom
- 4. Suggests our universe
- 6. static in the airwaves
- 7. symbol he
- 10. used to study light