Meteors enter our atmosphere at ridiculous speeds: **more that 10 kilometers per second**. They go so fast that air just can’t get out of the way and get compressed to very high pressures, which makes it insanely hot.
Things leaving the atmosphere don’t go quite as fast which is why they don’t burn up. Objects comming back from orbit go fast too, typically around 7km/s if from the ISS so they heat up too
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