Why things easily leave earths atmosphere but burn up while re-entering the same atmosphere
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Atmosphere is denser near the ground and thinner near space. As a rocket goes up, it is accelerating. It’s going slow when it is moving through thick air, and faster only in the thin air. When it reenters, it is going extremely fast, and will hit thicker air while still going faster, unless it wastes a lot of fuel actively decelerating.
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