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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 does'nt’t share this multi-directional freedom.
“In this four-dimensional space-time, you’re only able to move forward in time,” Liu told LiveScience.
A handful of proposals exist for time travel.
The most developed of these approaches involves a wormhole—a hypothetical tunnel connecting two regions of space-time.
The regions bridged could be two completely different universes or two parts of one universe.
Matter can travel through either mouth of the wormhole to reach a destination on the other side.
“Many people who study the subject doubt that that approach has any chance of working,” Greene said in an interview .
“But the basic idea if you’re very, very optimistic is that if you fiddle with the wormhole openings, you can make it not only a shortcut from a point in space to another point in space, but a shortcut from one moment in time to another moment in time.”
Originally posted by dAlen
I think all things are possible...not all things are understood.
It seems we want to 'know' somethings so we label it as a definite..."can do" / "cant do" when in reality...we dont have conclusive evidence.
Just conclusive from our (lack of) experience and knowledge (which is not all comprehensive.)
Originally posted by johnsky
That... or you could just use a distant star to look at the light bounced back from our own planet. Buuut, our technology isnt that precise yet.
Originally posted by bokinsmowl
if i can go backwards but not forwards... after i go back in time, will i be able to return to my originating time? you say i cant go forwards normally because those events haven't happened yet, but in this case the future had happened already. so can i go forwards to my originating time? i guess itd be like using a tivo...
Originally posted by theBman
Right, according to Einstein.
It's possible to go back in time. All thats required is to travel faster than the speed of light.
However, also according to Einstein it is impossible to travel faster than the speed of light.
Here is a great horizon episode about time travel.
And here is a very simple explanation of time, light and time travel.
[edit on 8/3/07 by theBman]
Einstein thinks he has a continuous field theory that avoids 'spooky action at a distance', but the calculation difficulties are very great. He is quite convinced that some day a theory that does not depend on probabilities will be found.
(Albert Einstein to Max Born, 1947, 'The Born-Einstein Letters' Max Born, translated by Irene Born, Macmillan 1971)