Across
- 1. cooler areas on surface
- 3. start of explosions
- 4. all old stars
- 6. 9 trillion miles
- 7. bright center of distant galaxy
- 8. collapsed neutron star, no light escapes
- 9. collapsed core of a high mass star
- 10. warm rises cool sinks
- 11. squeezing atoms together
- 13. loop of gas
- 14. hottest layer of atmosphere
- 16. cloud of gas and dust
- 18. no shape, small galaxy
Down
- 2. new stars in arms, old stars in middle
- 5. fusion of H2 and He
- 8. raisins move apart as bread dough rises
- 12. tells us galaxies are moving away
- 15. apparent shift
- 17. stream of charged particles