What's the hardest part of space travel?

Following are few hardest parts of space travel:
i) Gravity’s drag: To fly free from the gravity’s pull, one must attain the speed which is greater than 25,000 mph.
ii) Once we are out of the earth’s atmosphere, the particles travel towards us at a speed of light and also the air present in space may cause cancer, cataracts, and also Alzheimer’s.
iii) Landing back on the earth would be difficult as there is no option for crashing.

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