I'm Seeing Stars!!!!

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Across
  1. 3. star shaped flower
  2. 4. the branch of physics that deals with stars
  3. 6. a person who observes the stars
  4. 7. study of the stars
  5. 8. star-shaped symbol used to call attention to text
Down
  1. 1. a starfish
  2. 2. knowledge from the stars
  3. 3. a large rock that orbits a star
  4. 5. a person trained by NASA to travel in space