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Kawoomba comments on Rationality Quotes June 2013 - Less Wrong
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It could counteract the gravitational pull which would cause the surface of a hollow Earth to collapse otherwise. Edit: It would not :-(
A spherically symmetric shell has no effect on the gravitational field inside. It will not pull the surface of a hollow Earth outwards.
You're correct. There's other ways to guard against collapse of an empty shell, it's a similar scenario to guarding against collapse of a Dyson sphere.