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Is it possible to travel through time?
Question Date: 2006-01-20
Answer 1:

There is a great deal of reason to believe that the answer is "no", the strongest of which is that nobody from the future has ever come back in time to visit us here in the present. That said, some physicists have speculated about quantum foam, wormholes in both space and time that are on the scale of 10-35 meters in size, and science-fiction writers have further speculated that by enlarging and stabilizing these wormholes, it might be possible to use them to teleport around. So far, this quantum foam is entirely unobserved, so we aren't even sure that it exists, let alone that it is possible to enlarge it (or that it is practically feasible to do so).

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