Across
- 2. the universe was full of these when it began
- 4. Is made of matter
- 6. A theory that scientists made
- 7. One of the first elements found visible
- 8. Leftover radiation particles
- 10. A scientist that had a theory about the big bang
Down
- 1. Used to study light
- 3. Contributed a lot to the Big Bang Theory
- 5. Used to measure the movement of galaxies
- 9. What the universe is made of