Physics, Astronomy & Cosmology / Re: What would happen to a marble dropped into a hole through the Earth?« on: 27/07/2016 23:36:40 »
If the Earth was solid, (rather than having a hot soft center), and a hole was drilled all the way through, it would fill with air. The air-friction would slow the marble so it wouldn't overshoot the center by much. [ Collisions with the tunnel wall would also slow the marble down even further ].
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