Across
- 4. how slow something is moving away from you
- 7. theory of relativity
- 8. what all matter is composed of
Down
- 1. theory that galaxies are moving apart from each other
- 2. how fast something is towards you
- 3. used to study light
- 5. made up of all matter and space
- 6. beginning of the universe
- 9. leftover radiation