Scientists: You Can't Travel Back in Time

Although many theories have been postulated (wormholes, string theory, cosmic strings) as to how time travel would be possible, some scientists now state that time travel into the past is impossible.

There are a handful of scenarios that theorists have suggested for how one might travel to the past, said Brian Greene, author of the bestseller, “The Elegant Universe” and a physicist at Columbia University.“And almost all of them, if you look at them closely, brush up right at the edge of physics as we understand it. Most of us think that almost all of them can be ruled out.”

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