Galaxies and Stars

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Across
  1. 4. a sun
  2. 6. not regular
  3. 7. stars make-
  4. 11. a star
  5. 13. atomic number 2
  6. 14. swirling in a curve
  7. 17. measurement of how far
Down
  1. 1. very large star
  2. 2. the nature of something's ingredients
  3. 3. small
  4. 5. system of stars held by gas and dust
  5. 8. the atmosphere seen from the earth
  6. 9. lens or resembling a lens
  7. 10. darkness
  8. 12. a galaxy that has an elliptical shape
  9. 15. atomic number 1
  10. 16. form of matter