The Universe

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Across
  1. 4. so dense that light cannot escape gravity
  2. 5. our galaxy
  3. 8. all the galaxies,star systems, gas and dust
  4. 10. group of stars
  5. 12. a large red colored star that is collapsing inward on itself
  6. 14. galaxy that appears as a rotating disk of gas and dust
  7. 17. hypothetical form of energy
  8. 19. egg shaped rotating galaxy
  9. 23. gravitational collapse shrinks the stars core to a white glowing sphere
  10. 25. nuclear fusion in star's core produces helium from hydrogen
  11. 26. arms that spiral outwards off of a spiralgalaxy
  12. 27. group of a few to a thousand stars loosely held together by gravity
  13. 28. violent explosion that occurs when a stars core succumbs to gravity
Down
  1. 1. study of the universe
  2. 2. two stars orbiting eachother
  3. 3. theory of how the universe formed
  4. 6. galxy that contains few million to a billion stars
  5. 7. the shift of the absorption bands toward the red end of the spectrum
  6. 9. ball of glowing gas at a very high temperature
  7. 11. form of matter that we cannot se but know it exists
  8. 13. nuclei of two atoms combine to form a new atom
  9. 15. tens of thousands of stars held tightly together by gravity
  10. 16. group of hundreds of thousands of stars
  11. 17. change in frequency of a wave
  12. 18. stars that are grouped closely together
  13. 20. biggest group of stars
  14. 21. the leftover material in the core after a supernova explosion
  15. 22. galaxy that isn't spiral or elliptical
  16. 24. unit of measurement for stars that are relatively close to Earth