Rachel,
About gravity,
yes, it would have to be a very dense object to settle in the core, and
would probably take some time to get there. Physics kind of breaks
down at the center of really large objects (black hole, anyone?).
Nothing could ever hover in the center though. Depending on the mass of
the object, it will stop at an appropriate distance from the center of gravity, via Newton's law of gravitation.
If
you really want a better on grasp on science, try going to a
university. Science is a machine with vast connections between
theories, which really only create the likeliest of realities. It is
incredibly hard to push your own theories on ones that are already
established. Everything has a specialist that is backed up by rigid
research and peer review. It has a life of its own, if you think about
it. Humanity has been building on centuries of research which is why it
has become so hard for "Renaissance men" to break through like they
used to. Nobody will take you seriously these days without any
credentials. I learned that the hard way!
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