Across
- 2. what the universe is doing
- 8. radiation from the origin of the universe
- 10. the spectrum of wavelengths
Down
- 1. the scientists who discovered the theory of relativity.
- 3. particles the size of an atom
- 4. the force that keeps everything together
- 5. one of the first elements
- 6. the creation of the universe
- 7. made of leptons
- 9. everything that exists