Quote:
Originally Posted by Pazuzu
There are lots of geometries where you can find zero-gravity regions and high-gravity regions. A cylinder of material has gravity on the outside surface, but not the inside surface. If that cylinder was spinning along it's axis, then there would be false gravity inside, on the inner edge, and the false gravity would get smaller as you got closer to the center of rotation. The same rotating cylinder could now have zero "effective" gravity on the OUTSIDE, if you spun it just right.
So many weird things. Why would you be concerned about gravity in an empty shell in the middle of the Earth?
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Mostly I’m concerned because somebody else is already tackling the searing questions about what happened millions of years ago and billions of light-years away.
But also, my calculations didn’t look right. If the universe is expanding and everything in it is moving away from everything else at ever-increasing speeds, I was wondering if there is a center of it and what that center might look like. My intuition told me there can only be such an expansion if such a center has zero mass. Gravity, being a function of the mass of objects and their distances from each other, means that in order for expansion to occur one of the variables in the equation must be zero. Since the distance between objects cannot be zero, somewhere there must be no mass, which, as I suspected, would be the center.
Then I fell asleep.