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