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Re: What Causes Gravity?

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Posted by Zephram Cochrane/">Zephram Cochrane on November 14, 1999 05:58:08 UTC

: What exactly causes objects to stay on the planet?

Gravitation(or the metric tensor) is the geometry of space-time. Unless acted on by forces things will follow geodesic consistent with that geometry. It is the normal force on the object by the surface of the planet keep the object up on the planet, instead of falling to the core.

:Is it the rotation of the planet? If so, how fast would a singularity be rotating to create a black hole?

The rotation actually leads to a repulsion term in the acceleration rather than attraction.

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