Across
- 3. warm rises, cool sinks
- 5. apparent shift
- 6. hottest layer of atmosphere
- 8. collapsed-core-of-a-high-mass-star
- 10. cooler areas on surface
- 11. cloud of-gas-and-dust
- 14. star of expansion
- 15. fusion-of-h2-and-He
Down
- 1. loop of gas
- 2. tells us galaxies are moving away
- 4. bright center of a distant galaxy
- 7. stream of charged particles
- 9. squeezing atoms together
- 12. collapsed-neutron-star-no-light-escape
- 13. 6 trillion times