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Across
  1. 8. Spacecraft for moon landing
  2. 10. First US space station
  3. 11. Orbiting laboratory
  4. 13. Space probe exploring beyond the solar system
  5. 14. Outermost layer of atmosphere
  6. 16. Space shuttle
  7. 18. Space shuttle
  8. 20. Theory of relativity
  9. 22. Space telescope
  10. 23. Italian astronomer
  11. 24. Space shuttle
  12. 25. Alter a planet for life
Down
  1. 1. Study of life in space
  2. 2. Laws of gravity and motion
  3. 3. Heliocentric model proposer
  4. 4. Mars rover
  5. 5. Suitable for life
  6. 6. NASA's moon mission program
  7. 7. Space shuttle
  8. 9. Study of space
  9. 12. Electrically charged atmosphere layer
  10. 15. Theoretical physicist
  11. 17. First space shuttle
  12. 19. Laws of planetary motion
  13. 21. Planet outside our solar system