Stars and Galaxies

123456789101112131415161718192021
Across
  1. 1. Matter Matter with no light
  2. 4. shift to a different wavelength on the EM spectrum
  3. 8. a star's atmosphere
  4. 11. process where atom nuclei combine
  5. 15. instrument that splits light
  6. 16. layer which transfers heat to number 8
  7. 17. measure of brightness from Earth's POV
  8. 19. layer directly above a star's core
  9. 21. Unit of time based on light's speed
Down
  1. 2. distance between Earth and Sun
  2. 3. theory that tries to explain the universe
  3. 5. object with gravity strong enough to pull light
  4. 6. True brightness
  5. 7. dwarf remains of a dying star
  6. 9. collection of gas and dust
  7. 10. remains of a supernova
  8. 12. second layer of a star
  9. 13. "surface" of the sun
  10. 14. death of a star via explosion
  11. 18. Massive group of stars, planets, etc
  12. 20. big sphere of hydrogen gas