All the stars

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Across
  1. 6. Largest star in the universe (by volume)
  2. 8. A group of stars that form a pattern
  3. 11. Reddish giant star in Taurus
  4. 12. Giant red star in constellation Ram
  5. 13. The star system closest to our planet
Down
  1. 1. Constellation known as the "Hunter"
  2. 2. Great Bear
  3. 3. How stars produce energy
  4. 4. Brightest star in the night sky
  5. 5. Seven Sisters/Cluster of stars
  6. 7. All planets revolve around this star
  7. 9. Explosion of a big star
  8. 10. Second brightest star in the night sky