Across
- 1. What happened in the Big Bang
- 4. Cosmic background _________ is theorized to be thermal energy left over from the big bang
- 6. How many billion years ago the universe formed, to the nearest whole (.5 rounds up)
- 8. A huge cluster of stars, planets, and solar systems
Down
- 2. Scientists measure old types of this plural noun as a method of estimating the universe’s age
- 3. The study of the universe
- 5. The force that possibly could counteract the expansion of the universe
- 7. What the universe is constantly doing