Stars in the night sky

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Across
  1. 2. a large group of stars bound by gravity
  2. 3. professional trained to study stars
  3. 5. closest star to earth
  4. 6. group of stars
  5. 8. also called a falling star or shooting star
Down
  1. 1. star is a fast moving star
  2. 4. a colossal explosion of a star
  3. 5. ..astronomy, the study of stars
  4. 7. instrument used to study stars