Across
- 3. something nothing can get out of
- 7. a theory of how the universe started
- 8. 10 billon light years old
- 10. very small galaxy
- 11. does not have a regular shape compared to different galaxies
- 12. a explosion of a star
- 14. a dead star
- 15. when giant star dies
Down
- 1. a energy that affects our universe
- 2. study of the universe
- 4. our galaxy
- 5. with stars, gas, dust, and dark matter
- 6. something the sun will turn to in time
- 9. stars that orbit each other
- 13. we see a lot of them at night