Across
- 4. particles that helped form the objects in the universe
- 9. all space and matter that exists
- 10. a theory about the universe
Down
- 1. a tool used to study light
- 2. a fundamental particle with nuclear forces
- 3. a scientist known for his theory of relativity
- 5. relic radiation left over after the beginning of the universe
- 6. what the universe did after the big bang
- 7. one of the first elements created element #1
- 8. makes up about 25% of the mass in space