Spaced Out

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Across
  1. 5. Cosmic dust
  2. 7. "Twinkle, twinkle little ___"
  3. 9. The Blue Marble
  4. 10. The sun of the night
  5. 11. The smaller of two constellations that share a name
  6. 12. Named after a Roman god of agriculture
  7. 13. Fourth rock from the Sun
  8. 15. Earth's twin in size
  9. 16. Collection of orbs
Down
  1. 1. He's a great hunter in the stars
  2. 2. Home of the great red spot
  3. 3. The larger of two constellations that share a name
  4. 4. It guides sailors at night
  5. 6. It's axis is uniquely tilted
  6. 8. Deep blue gas giant
  7. 10. Small, speedy, and crater-covered
  8. 14. It gives us light