Are ion engines real?

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6. What happens if a plane flies too high?
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Tags

1. #atmosphere
2. #outside
3. #minuscule
4. #vacuum
5. #through
6. #significant
7. #because
8. #engine
9. #presence
10. #engines
11. #space
12. #overcome
13. #thrust
14. #practical
15. #resistance
16. #cannot
17. #vehicles
18. #additionally