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Message: <blockquote data-quote="Haltherrion" data-source="post: 5552783" data-attributes="member: 18253">If I recall my high school calculus correctly, the gravity inside a hollow sphere is zero. The gravitational pull of the shell cancels where ever you are within the shell, be it the inner surface or some point above the inner surface. As a thought experiment consider the 2D case of being within a circle. In the center you are equidistant from the circle surface. Move along the +x axis you approach the mass of the +x side of the circle but you have that much more mass "behind you" pulling away. Similarly if you were at the center of the earth, you would experience zero gravity. Of course you would also experience crushing pressure...</blockquote>