Out of this World!

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Across
  1. 1. Outer __
  2. 3. A group of stars, gas and dust held together by gravity.
  3. 5. Hottest planet
  4. 8. Famous Space Telescope
  5. 10. First Canadian to walk in space
  6. 13. Planet with colourful rings
  7. 14. Measurement of the universe
  8. 17. Planet we live on
  9. 20. First man on the moon
  10. 23. Where the astronauts live in space (abbr.)
  11. 24. Shooting Star, space particle entering the atmosphere
  12. 25. The red planet
  13. 26. Study of stars
  14. 28. An object moving around a star
  15. 29. Closest planet to the sun
  16. 30. The weight a rocket must lift
  17. 32. The Hunter (constellation)
Down
  1. 2. A cluster of stars
  2. 4. A person who goes to space
  3. 6. Body of a rocket
  4. 7. Planet with the big red spot
  5. 9. A bright object in space
  6. 11. Explosive gas, component of rocket fuel
  7. 12. Filtering water by evaporation
  8. 15. The Twins (constellation)
  9. 16. Gas we breathe, component of rocket fuel
  10. 18. Newest Rover on Mars
  11. 19. Process of cleaning water
  12. 21. The force that holds us to the earth
  13. 22. The force that lifts a rocket
  14. 26. Space rock
  15. 27. The galaxy we live in
  16. 29. The cow jumped over the __
  17. 30. Ex Planet
  18. 31. The path one object travels around another