Why hydrogen is used as a rocket fuel?

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Tags

1. #space
2. #which
3. #stage
4. #rocket
5. #those
6. #higher
7. #known
8. #coolant
9. #efficient
10. #shuttle
11. #altitudes
12. #rockets
13. #engine
14. #stages
15. #launch
16. #hydrogen
17. #first
18. #upper