Eli5: why isn’t someone upside down when they are on the south pole of the earth?
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Because what we consider “down” is towards whatever gravitational force that has the strongest pull on us. The amount of gravitational pull something has is relevant to how much mass it containts, because mass compresses space, which causes smaller objects nearby to “fall” towards it. In our case, the center of earth is the point with the strongest gravitational pull, and we’re the small objects that’s falling towards it.
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