Galaxies+H-R diagrams

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Across
  1. 3. a system with millions/billions of stars
  2. 5. the time it takes the sun's light to reach Earth(word form with under quotes)
  3. 7. the star group the sun belongs to
  4. 9. celestial objects made of burning gas
  5. 11. another word for brightness
  6. 12. a galaxy with arms
Down
  1. 1. the way an H-R diagram's temperature increases
  2. 2. our home Spiral galaxy
  3. 4. a galaxy with no set shape or color
  4. 6. the distance light travels in a year
  5. 8. most common galaxy in our universe
  6. 10. the temperature form used to measure on a H-R diagram