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Originally Posted by dtheriault
If you had a planet with a mantle that was more dense than the core could gravity move outward?
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No, because the mantle is spherical. If you are inside the core, you would still be subjected to the gravity from all sides of the mantle, even if there is one that you are closer to. This would require one hell of a structurally sound core, though, to keep the mantle from collapsing in on it.
In theory, you could have a (man-made) structure with NO core, a la the halos in the video game Halo or a empty sphere or something. In this situation if you were "inside" it, then yes, you would get pulled outward if the radius of the object was sufficiently large, the object had a whole lot of mass, and was separated from other significant gravitational fields.
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Originally Posted by charlatan
But what is gravity?
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Excellent question. Gravity is the only force for which particles have not yet been discovered. Scientists theorize about "gravatons", which would be the particulate unit of gravity, but that would be one hell of a particle, since it would be powerful enough to connect everything in space (even to a minute degree) and totally ignore any forms of mass or other particles in its way. The notion is that gravity does not have a particle associated with it, but then that goes against everything else in the universe.