06-06-2007, 12:53 AM
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Confirmed User
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Join Date: Nov 2004
Posts: 2,779
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read this....
http://en.wikipedia.org/wiki/Time_tr...sing_wormholes
...One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine;[15] in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backwards in time. This could provide an alternative explanation for Hawking's observation: a time machine will be built someday, but has not yet been built, so the tourists from the future cannot reach this far back in time.
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