Lunar Mysteries: Explore the mysteries of Earth's closest celestial neighbor

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Across
  1. 2. Layer of loose, fragmented material covering the Moon's surface
  2. 3. Passage of the Moon across Earth’s sky or a telescope’s view
  3. 4. Scientific study of the Moon’s geology
  4. 7. Moon phase when more than half is illuminated but not full
  5. 8. Ocean movements influenced by lunar gravity
  6. 12. Hemisphere of the Moon not visible from Earth
  7. 14. Current NASA program aiming to return humans to the Moon
  8. 16. Dark volcanic rock common on lunar maria
  9. 18. Long, narrow valley or trench on the lunar surface
  10. 19. Earth's natural satellite
  11. 20. Lunar rock type rich in potassium, rare earth elements, and phosphorus
Down
  1. 1. Light-colored rock dominating the lunar highlands
  2. 5. Target region for future lunar bases due to water ice deposits
  3. 6. Dark, flat plains on the Moon formed by ancient lava flows
  4. 9. Frozen water detected in shadowed lunar craters
  5. 10. 29.5-day cycle between identical Moon phases
  6. 11. Wobbling motion allowing us to see slightly more than half the Moon
  7. 13. Bowl-shaped depression formed by meteor impacts
  8. 15. Event when Earth or Moon blocks sunlight from the other
  9. 17. NASA program that landed humans on the Moon