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