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Across
  1. 4. Horizons, Pluto mission
  2. 6. Mars rover
  3. 8. Shuttle disaster in 1986
  4. 13. US space station
  5. 14. Private spaceflight company
  6. 15. First artificial satellite
  7. 16. Tereshkova, first woman in space
  8. 19. Explored Martian surface
  9. 20. Famous aborted moon mission
Down
  1. 1. NASA's two-man missions
  2. 2. First to reach the moon
  3. 3. Jupiter probe
  4. 5. Space probe launched in 1977
  5. 7. First man in space
  6. 9. Space telescope launched in 1990
  7. 10. First human spaceflight
  8. 11. NASA's first manned program
  9. 12. Pathfinder, Mars lander
  10. 17. International Space Station
  11. 18. First manned moon landing