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