subject: Time Travel - Will It Ever Be Possible? [print this page] Time travel is possibly the most interesting issue in all of physics. On the other hand, there's not much physicists can do about it; it is just not yet possible to do much work on the subject. Aside from a very few very specific experiments "around the edges," it isn't possible to investigate time the way physicists are able to examine most other aspects of this universe.
You can find many puzzling issues in the study of time. Many physicists even claim that time is an illusion, that there is no such "thing" as time. Such scientists, sounding a lot more like philosophers, believe that time is an illusion of the way our human consciousness is structured.
Another fundamental issue that perplexes those studying time concerns its unidirectional flow. Most aspects of our universe are symmetrical, or in balance, but time is one of the glaring exceptions which is decidedly one way and no other.
It seems impossible to go backwards in time, yet no one can venture exactly why. Of course, it will be illogical to travel into the past and kill oneself or one's forebears - but that in itself doesn't explain why time can't flow backwards, as in the case of a broken vase "reordering" itself or a glass of milk "unspilling" itself. Such occurrences would be illogical, but lack of logic is no explanation in and of itself.
The closest physicists are able to come to explaining this puzzle involves the related concept of entropy. Time's unidirectional flow onwards towards the future and the fact of entropy in our world seem to be intimately linked. For some reason, "things break down," the natural progress of the universe is to break down, wind down, unwind, fall apart.
It's almost certain that no time travel into the past is possible. But no one is able to decisively prove it, in large part due to the whole mystery over just what time is.
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by: Aaron Miller.
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