Stephen Hawking Says Time Travel May Be Possible

In The Daily Mail, Stephen Hawking writes that time travel may be possible. Since time and space are "wrinkled", people might use these wrinkles as shortcuts in time:

Nothing is flat or solid. If you look closely enough at anything you'll find holes and wrinkles in it. It's a basic physical principle, and it even applies to time. Even something as smooth as a pool ball has tiny crevices, wrinkles and voids. Now it's easy to show that this is true in the first three dimensions. But trust me, it's also true of the fourth dimension. There are tiny crevices, wrinkles and voids in time. Down at the smallest of scales, smaller even than molecules, smaller than atoms, we get to a place called the quantum foam. This is where wormholes exist. Tiny tunnels or shortcuts through space and time constantly form, disappear, and reform within this quantum world. And they actually link two separate places and two different times. [...]

Given enough power and advanced technology, perhaps a giant wormhole could even be constructed in space. I'm not saying it can be done, but if it could be, it would be a truly remarkable device. One end could be here near Earth, and the other far, far away, near some distant planet.

Theoretically, a time tunnel or wormhole could do even more than take us to other planets. If both ends were in the same place, and separated by time instead of distance, a ship could fly in and come out still near Earth, but in the distant past. Maybe dinosaurs would witness the ship coming in for a landing.

Link via Geekologie | Image: NASA

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Even if such a tunnel is practically made somewhere in the near future, say, on 2050 the scientists won't come back to 2010 or even 1900; they wold probably go see the dinosaurs or centuries even backwards.
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He meant it is possible THEORETICALLY. Thus 'We haven't welcomed future travelers' is not a valid proof that it is impossible.
We may not be able to make the time tunnel, but it could be possible.
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