Across
- 2. year: 6 million miles.
- 4. hole: collapsed neutron star, no light escapes.
- 6. wind: stream of changed particles.
- 9. warm rises, cool sinks.
- 11. cooler areas on surface.
- 14. loop of gas.
- 15. cloud of gas and dust.
- 17. effect: tells us galaxies are moving away.
- 18. squeezing atoms together.
Down
- 1. galaxy: young.
- 3. bright center of a distant galaxy.
- 4. dough theory: the raises spread apart as the bread rises.
- 5. galaxy: unknown.
- 7. sequence: fusion of H, and He.
- 8. hottest layer of atmosphere.
- 10. galaxy: old.
- 12. apparent shift.
- 13. star: collapsed the core of a high mass star.
- 16. bang: start expansion.