Across
- 4. A word to describe how the universe is structured
- 5. a cluster of stars, planets, and solar systems
- 6. scientists think that the universe will _____
- 7. the energy left over from the big bang
- 8. the study of the universe
Down
- 1. a measurable quality that scientists use to determine the age of the universe
- 2. how the universe began
- 3. What the galaxies and stars started to do after the big bang