Comprehension Checks

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Across
  1. 2. Terrain
  2. 6. and Harsh
  3. 7. Inhospitable
  4. 8. Callisto
  5. 10. great red Spot
  6. 12. Unranus
  7. 14. Mercury
  8. 15. Evening Star
  9. 18. Moons
Down
  1. 1. Monarch
  2. 3. Star
  3. 4. Surface
  4. 5. and Craters on Venus
  5. 9. Planets
  6. 11. Ganymede
  7. 13. Planet
  8. 16. Europa
  9. 17. Uranus