Across
- 3. warm rises cool sinks
- 9. outer stars hot and young and inner older
- 11. star collapsed core of high mass star
- 12. 9 trillion years
- 14. apparent shift
- 16. bang start of expansion
- 18. loop of gas
- 19. shape that is not normal
Down
- 1. cooler areas on surface
- 2. wind stream of charged particles
- 4. all old
- 5. hottest layer of atmosphere
- 6. bright center of a distant galazies
- 7. squeezing atoms together
- 8. raisins spread apart as the bread rises
- 10. sequence fusion of H, and He
- 13. hole collapsed neutron star no light escapes
- 15. pulls us galaxies are moving away
- 17. cloud of gas and dust