why does the space shuttle not burn up on leaving our atmosphere?

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when the space shuttle is coming back to earth, it has a curious angle of descent so it does not burn up. Why then, does it not burn upon leaving the earth?


Offline daveshorts

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On the way up the space shuttle is not going very fast when it goes through the thicker parts of the atmosphere and it continues speeding up once it is over the atmosphere. On the way down on the other hand it will only slow down when it hits the thicker atmosphere so it will suddenly meat a hughe amount of friction and burn out.