If colonists burrowed far enough under the ice on Ganymede or Europa, would the ice provide adequate protection for them from Jupiter's radiation?
If we got to Mars right now and landed at the poles (where there is a lot of water ice) how long would we be able to stay there?
How deep a valley or trench would be needed on Mars to provide the same atmospheric pressure as 6 km above sea level on Earth?
Would the one million people on Mars be killed by an impact equivalent to an Extinction Level Event on Earth
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