Question

Why is reentry into earth's atmosphere so difficult upsc

Answer 1

It is easy to penetrate the atmosphere quickly, and burn up like a meteor. The problem is to enter slowly. You can do that too, but it would take a huge amount of fuel with ordinary rockets. You can do it with aerobraking, including a surprisingly slow re-entry with an orbital airship; and there are some other ideas that may be possible in the not too distant future, such as a space elevator, or spinning “skyhooks”.

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