Question

How and why is hydrogen used by astronauts?

Answer 1

because hydrogen has high calorific value and one the lightest gas.

Answer 2

Hey mate... Here is your answer....

HYDROGEN IS USED FOR FUEL, WARMTH AND WATER BY THE ASTRONAUTS.....

THIS HAS SEVRAL REASONS...

1) HYDROGEN IS LIGHT AND IS A GAS THEREFORE IT IS EASIER TO CARRY...
2)HYDROGEN IS AN EXCELLENT FUEL AS IT PRODUCE A LOT OS ENERGY AND GIVES VERY LESS RESIDUE...
3) HYDRODWN CAN BE REACTED WITH OXYGEN TO PRODUCE WATER.....

HOPE IT HELPS!!

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