Across
- 3. A group of galaxies close together.
- 6. The force that pulls objects toward each
- 8. The process of the universe getting
- 10. explosion.
- 11. of the universe.
Down
- 1. Squeezed into a very small space.
- 2. The study of the origin, structure, and
- 4. Energy that travels through space.
- 5. A large system of stars, gas, and dust held
- 7. by gravity.
- 9. bang: The theory that the universe began with a