Astronomy, by Kiran Hood and Cove Sillero

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