To the Moon...and back

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Across
  1. 3. nasa affilate laboratory
  2. 9. autonomous vehicle
  3. 12. space telescope James
  4. 13. first powered flight on another planet
  5. 16. ~671 million mph
  6. 17. point of no return
  7. 18. swan constellation
  8. 19. first human in space
Down
  1. 1. spheres found in eagle crater
  2. 2. of mars origin
  3. 4. harp in the sky
  4. 5. son and moon of mars
  5. 6. the twins
  6. 7. Florida's space center
  7. 8. earth-like moon
  8. 10. first successful mars landing
  9. 11. potentially habitable exoplanet
  10. 14. estrellita blanco
  11. 15. solar energy visible during eclipse