Universe vocab

12345678910111213141516171819202122232425262728
Across
  1. 2. tens of thousands of stars that are held tightly together by gravity
  2. 6. hypothetical form of energy, may make up as much as 71% of the energy in the universe
  3. 8. this is so dense that light cannot escape the gravity
  4. 9. group of stars
  5. 11. stars that are grouped closely together
  6. 12. gravitational collapse shrinks the stars core to a white glowing sphere
  7. 15. matter that we cant see but know exist; does not emit electromagnetic radiation
  8. 17. groups of hundreds or thousands of stars
  9. 18. most widely accepted cosmological explanation of how the universe formed
  10. 19. the study of the universe
  11. 22. method of measurement for stars that are relatively close to earth
  12. 23. all of the star systems, galaxies, gas and dust
  13. 25. galaxies that are not spiral or elliptical
  14. 26. appear as a rotating disk of stars and dust
  15. 27. a violent explosion that occurs when a stars core succumbs to gravity
  16. 28. egg-shaped rotating galaxy
Down
  1. 1. change in frequency of a wave related to an observer moving in relationship to the source of a wave
  2. 3. that spiral outward off of spiral galaxies
  3. 4. a large red-colored star that is collapsing inward on itself
  4. 5. nuclei of two atoms combined to form a new atom
  5. 7. the shift of the absorption bands toward the red end of the spectrum
  6. 10. nuclear fusion in the stars core produces helium from hydrogen
  7. 11. ball of glowing gas at a very high temperature
  8. 13. planet
  9. 14. two stars orbiting each other
  10. 16. the leftover material in the core after a supernova explosion
  11. 20. groups of two to a thousand stars loosely held by gravity
  12. 21. our galaxy
  13. 24. biggest group of stars; may contain hundreds of thousands of stars