Across
- 3. the fastest thing in the universe
- 5. basic element in 73% of visible mass in the universe
- 7. the galaxy the solar system is in
- 8. the widely known theory of the beginning of the universe
- 9. stars, dust and gas held together by gravity in one area
- 10. a large ball of gas mainly composed of hydrogen and helium
- 11. contains all matter, space and time
Down
- 1. energy in waves
- 2. all matter consists of these
- 4. a force between all objects with mass
- 6. used to study light