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11 votes
5 answers
7k views

Why do you need a heat shield on Mars entry if the atmosphere is so thin?

Mars' atmosphere is only .088 psi. Is that enough to cause heat at high altitude? Shouldn't you be able to fly close to the surface at orbital speeds like on the moon? How does a parachute work with ...
dumbass's user avatar
  • 129
4 votes
3 answers
1k views

Would a balloon pop if dropped from space?

Could a "simple" inflated party balloon be dropped from space entering an atmosphere? The first case at orbital speed, the second case just outside the atmosphere and the third interplanetary? The ...
Muze's user avatar
  • 1