Athena Rising III

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Across
  1. 3. Riley's favorite safety hazard?
  2. 4. Stardust who played guitar with the spiders from Mars
  3. 7. Cloud on the outskirts of our solar system
  4. 11. Standing between us and the eternal vacuum of space
  5. 15. Bowie character "waiting in the sky"
  6. 18. Alan who made a big first
  7. 21. This
  8. 22. Robotic dog (real)
  9. 25. Armani's official title
  10. 26. Leonard Nimoy
  11. 27. Don't repeat this star thrice
Down
  1. 1. This
  2. 2. You are here
  3. 5. You are here
  4. 6. The saboteur
  5. 8. Blood moon?
  6. 9. Swath of empty space with a few occasional rocks
  7. 10. Seated star collection?
  8. 12. Interstellar arm of the American military
  9. 13. Russian dog in space
  10. 14. CASA department that made this puzzle
  11. 16. Robotic dog
  12. 17. Apollo rocket
  13. 19. CASA's space program? (you can't get rid of this one)
  14. 20. Day one wing tester
  15. 23. Bear that comes in major and minor variations
  16. 24. Hal refuses to open these
  17. 27. Robotic dog