CUE Crossword #9

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Across
  1. 3. Missing pilot, never found (2 words)
  2. 5. Mysterious airplane hijacker (last word only)
  3. 6. Not a ghost, but can still cause a disturbance
  4. 10. Detective writer (3 words)
  5. 11. A rather complicated way to get twins of different ages (2 words)
  6. 16. The sport Americans call the "ball game"
  7. 17. Missing ship, recently found
  8. 18. Kronos' counterpart
  9. 19. Nothing escapes it, not even light (2 words)
  10. 20. Shortcuts through the universe
Down
  1. 1. Living permanently elsewhere than Earth (2 words)
  2. 2. Annual highest tide (2 words)
  3. 4. Pulling you down
  4. 7. When the force of gravity itself conspires to make you age slower/faster (2 words)
  5. 8. Sleeping for decades or centuries (2 words)
  6. 9. Eight, rotated on its side
  7. 12. Largely watery planets (2 words)
  8. 13. Orbits black holes instead of stars
  9. 14. Famous New Zealand mountaineer (2 words)
  10. 15. Phenomenon causing Black Sunday (2 words)