why is atmosphere reentry such an issue? If it is just because of speed hitting the atmosphere why can’t the spacecraft just slow down before and synchronise with earth rotation?
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The extreme speeds they’re at is the only thing keeping them in orbit. The moment they start decelerating, they start to fall towards Earth, reentering the atmosphere. So there’s no way to slow down *before* reentering the atmosphere, because slowing down is what *causes them* to reenter the atmosphere.
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