Astr- and Bene-/bon-

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Across
  1. 2. extra payment
  2. 4. kind and generous
  3. 5. sudden misfortune
  4. 9. space traveler
Down
  1. 1. good effect
  2. 2. large, outdoor fire
  3. 3. helpful to health
  4. 6. study of space
  5. 7. study of stars' influence
  6. 8. rocky, space object