Astronaut training puzzle

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Across
  1. 3. people who go to space
  2. 5. small rock that hits Earth
  3. 7. what happens in space
  4. 9. where the astronauts go
  5. 12. a place that mimicts space
  6. 14. what astronauts need to go to space
  7. 15. where they train
Down
  1. 1. loud sound
  2. 2. what keeps people down
  3. 4. happens if they don't exercise
  4. 6. How they get to space
  5. 8. ball of gas in the sky
  6. 10. they need to do in space
  7. 11. were they go
  8. 13. how the rockets take off