Across
- 2. cosmic space
- 6. explosion
- 7. consisting of gas
- 8. symbol is He
- 9. atomic beam
- 10. the galaxy
- 11. symbol is H
Down
- 1. the theory for the origin of the universe
- 3. compacted matter
- 4. as a result of the force of gravity
- 5. the smallest particle of a chemical element