Outer Space

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Across
  1. 2. Earth's natural satellite
  2. 4. The Red Planet
  3. 6. Space rock
  4. 9. A sudden bright star
  5. 10. Former 9th planet
Down
  1. 1. Path around a planet
  2. 3. U.S. space agency
  3. 5. Empty space
  4. 7. A glowing gas ball
  5. 8. Icy space traveler