Across
- 7. big red stars
- 8. 75% of the universe
- 9. leftovers of the big bang
- 10. traces of this element everywhere
Down
- 1. the start of the universe
- 2. light moving toward
- 3. big explosion of a star
- 4. light moving away
- 5. the measure of light
- 6. 25% of the universe