Astronomy

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Across
  1. 7. round or flattened balls or odd stars
  2. 9. a large cloud of dust and gas
  3. 11. patterns in the night sky
  4. 13. a spiral galaxy
  5. 14. has a bulge in the middle
  6. 15. active young galaxies with black holes in the center
Down
  1. 1. a huge group of single stars
  2. 2. distance that light travels in one year
  3. 3. most stars are members of groups.
  4. 4. measure of the amount of light received on earth
  5. 5. the range of wave lengths that stars emit
  6. 6. they are made by contracting gas and dust
  7. 8. made when stars run out of fuel
  8. 10. began 13.7 billion years ago
  9. 12. no regular shapes bright young stars