Across
- 3. cooler areas on surface
- 8. collapsed core of a high mass star
- 9. the raisins spread apart as the bread rises
- 11. start of expansion
- 12. bright center of a distant galaxy
- 13. stream of charged particles
- 16. apparent shift
- 17. cloud of gas and dust
- 18. tells us galaxies are moving away
- 19. warm rises, cool sinks
Down
- 1. squeezing atoms together
- 2. loop of gas
- 4. 9 trillion miles
- 5. a spiral shaped galaxy with hot young stars on the arms and old stars in the middle
- 6. no shape, stars everywhere
- 7. hottest layer of atmosphere
- 10. oval shaped galaxy
- 14. fusion of h2 and he
- 15. hole collapsed neutron star no light escapes