Stars Galaxies and the Universe

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Across
  1. 2. a unit astronomers typically use
  2. 5. a stars brightness compared with others stars from the view of earth
  3. 8. one unit distances between stars
  4. 9. star at the end of the big dipper
  5. 11. very large stars
  6. 13. Created a way to find stars using somethin like a address
  7. 14. can be half half or four times the earths diameter
  8. 15. group of stars that are close enough to be held together by gravity
Down
  1. 1. introduce the concept of the big bang theory
  2. 3. city sized stars
  3. 4. apparent magnitude that a star would have if we placed it at a standard distance
  4. 6. unimaginably dense object
  5. 7. main property used in naming stars
  6. 10. cloud of dust or dust that can be seen in the background of stars
  7. 12. a celestial body that generates electromagnetic energy