Astronaut training

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Across
  1. 3. what's left of something that is destroyed
  2. 5. a boundless three dimensional extent where astronauts usually go
  3. 7. a person trained to travel and work in space
  4. 9. system of millions and billions of stars
  5. 11. when you prepare for something your gonna do
  6. 12. body of rock and metal that is usually in space
  7. 16. someone who undertakes a long journey by sea or space
  8. 18. a form of transportation relating to space
  9. 20. the cosmos
Down
  1. 1. related to armed forces
  2. 2. a large body of water that's part of the hydrosphere
  3. 4. the thing we need to breath
  4. 6. a celestial body that revolves around the Sun
  5. 8. has to do with engineering and technology
  6. 10. curving or spinning around something
  7. 13. the thing astronauts use to get to space
  8. 14. a rock body that orbits Earth
  9. 15. the planet we live on
  10. 17. little pieces of light in the sky
  11. 19. to set or begin