Across
- 9. the stuff that was here before the universe started
- 10. A theory of how the universe started
- 11. space where galaxies are and every bit of matter
Down
- 1. Leftover radiation to support the big bang theory
- 2. discovered that the universe is moving apart
- 3. one of the abundant elements when the galaxy was forming
- 4. a mixture of stars and planets in the universe
- 5. become or make larger or more extensive.
- 6. one of the abundant gasses in our galaxy used in balloons
- 7. discovered the theory of relativity
- 8. used to study the light temperatures