Across
- 5. Hottest layer of atmosphere
- 6. Bright center of a distant galaxy
- 7. apparent shift
- 8. stream of charged particles
- 9. loop of gas
- 10. Young stars in the arms old stars in the center
- 12. cloud of gas and dust
- 13. cooler areas in surface
- 14. collapsed core of a high mass star
- 17. smallest galaxy
- 18. warm rises cool sinks
- 19. 9 trillion miles
Down
- 1. Squeezing atoms together
- 2. start of expansion
- 3. tells us galaxies are moving away
- 4. the raisins spread apart s the bread rises
- 11. Fusion of H2 and He
- 15. All old stars
- 16. collapsed neutron star no light escapes