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Time Tavel to the past impossible scientists say


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source: http://www.livescience.com/scienceoffiction/070307_time_travel.html


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.'

'Space and time are tangled together in a sort of a four-dimensional fabric called space-time,' said Charles Liu, an astrophysicist with the City University of New York, College of Staten Island and co-author of the book 'One Universe: At Home In The Cosmos"


The bending of space-time causes objects to move on a curved path and that curvature of space is what we know as gravity.


Mathematically one can go backwards or forwards in the three spatial dimensions. But time doesn't share this multi-directional freedom.


'In this four-dimensional space-time, you're only able to move forward in time,' Liu told LiveScience.

Video: http://www.livescience.com/php/video/player.php?video_id=Time_travel_lite



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