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