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