Astronomy, by Kiran H. and Cove S.

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Across
  1. 2. The unit that the temperature of stars get measured by
  2. 7. The center of our galaxy
  3. 8. The distance between the crests of two waves
  4. 10. The brightness of a star
  5. 12. Galaxies with a round or egg-like shape
  6. 14. A cloud of gas and dust where stars are formed
  7. 15. A popular theory for how our universe formed
Down
  1. 1. Where stars spend most their lifetime
  2. 3. A galaxy with 2 or more arms
  3. 4. A way of classifying stars that uses letters
  4. 5. Used to measure distance in space
  5. 6. The size of a star
  6. 9. Light with a slightly higher frequency than visible light
  7. 11. Our galaxy
  8. 13. Galaxies have an irregular shape