Across
- 1. Matter Matter with no light
- 4. shift to a different wavelength on the EM spectrum
- 8. a star's atmosphere
- 11. process where atom nuclei combine
- 15. instrument that splits light
- 16. layer which transfers heat to number 8
- 17. measure of brightness from Earth's POV
- 19. layer directly above a star's core
- 21. Unit of time based on light's speed
Down
- 2. distance between Earth and Sun
- 3. theory that tries to explain the universe
- 5. object with gravity strong enough to pull light
- 6. True brightness
- 7. dwarf remains of a dying star
- 9. collection of gas and dust
- 10. remains of a supernova
- 12. second layer of a star
- 13. "surface" of the sun
- 14. death of a star via explosion
- 18. Massive group of stars, planets, etc
- 20. big sphere of hydrogen gas