Space words!!!

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Across
  1. 4. who is the main character?
  2. 6. what is someone called when they explore space?
  3. 7. the opposite of dependently?
  4. 9. what's the opposite of ungravitational?
  5. 10. some people have fear and others are________.
Down
  1. 1. what is the main character's last name?
  2. 2. what was the animal in space?
  3. 3. what is the environment that planets and stars live in?
  4. 5. what gives you internet?
  5. 8. if you are standing on a hover board you are ______