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Old October 5 2012, 03:12 AM   #65
The Borgified Corpse
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Re: About planetary gravity

Suppose the universe were closed, but still edgeless? What if the universe as we perceive it were really the 4th dimensional equivalent of a sphere? If you travelled forever along its 3-dimensional "surface," you'd never reach the edge, although you might eventually come back to the point from which you started.
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