Human Adaptation to Space

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Across
  1. 2. take something away from
  2. 7. operated by, or performed by a human
  3. 12. path of a celestial body or an artificial satellite as it revolves around another body
  4. 15. perceive or indicate differences; discriminate
  5. 16. keep in existence; maintain.
  6. 18. physical or mental disorder, especially a mild illness
  7. 19. act or process of depicting or portraying
Down
  1. 1. in accord with or characteristic of the normal functioning of a living organism
  2. 2. period of existence or persistence
  3. 3. chance of being injured or harmed; danger
  4. 4. act or an instance of exposing
  5. 5. lack of order or regular arrangement; confusion
  6. 6. curve outward
  7. 8. and propagation and emission of energy in the form of rays or waves
  8. 9. in one or more directions
  9. 10. to a galaxy
  10. 11. substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
  11. 13. feeling of sickness in the stomach characterized by an urge to vomit
  12. 14. follow in an effort to overtake or capture; chase
  13. 17. natural force of attraction exerted by a celestial body, such as Earth, upon objects at or near its surface, tending to draw them toward the center of the body.