Back up Plan

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Across
  1. 1. A person trained to travel and work in space
  2. 4. When a system stops working the way it should
  3. 6. A group of parts that work together to do a job
  4. 8. Sending and receiving information
  5. 9. The computer programs that control how a machine works
  6. 10. A small rocket engine that helps control movement in space
  7. 12. The curved path an object takes around a planet
  8. 16. The ability of something to work correctly over time
  9. 17. The chance that something could go wrong
  10. 18. Having extra systems that can take over if one fails
Down
  1. 2. The gas humans need to breathe
  2. 3. Tools and machines created to solve problems
  3. 5. The plan made before building something
  4. 7. A vehicle designed to travel in space
  5. 11. Being protected from danger or harm
  6. 13. Trying something out to make sure it works properly
  7. 14. An extra system that replaces the main one if it stops working
  8. 15. An important task or journey in space exploration