Universe Today - 2010 Feb 28
The axiom that what goes up, must come down doesn’t apply to most places in the universe, which are largely empty space. For most places in the universe, what goes up, just goes up. On Earth, the tendency of upwardly-mobile objects to reverse course in mid-flight and return to the surface is, to say the least, remarkable.
It’s even more remarkable if you go along for the ride.
An improvement on the standard two dimensional rubber sheet analogy for curved
space-time - although it still lacks the contribution of the all-important time dimension.
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