The laws of physics seem to allow time travel, but no one has had much hope of building an actual time machine because it would take such exotic conditions and materials. Now, physicist Amos Ori of the Technion Israel Institute of Technology in Haifa has come up with a potentially more practical time machine design. Unlike most previous proposals, this one requires only normal matter and the vacuum known to exist in space, says Ori. One type of time travel occurs routinely here and now: our inexorable one-way drift into the future. Einstein's special theory of relativity revealed the possibility of accelerated travel into the future. Suppose a person spends a year in a rocket that's traveling slightly less than the speed of light.

Because motion at such enormous speeds drastically slows the clock for the traveler, that person could return to Earth to find that many years had elapsed at home. In that way, a traveler could leap into the future. Retreating into the past is another matter, but one that relativity theory also suggests might be possible. The theory shows that gravity curves space-time and slows clocks. That's why time-travel theorists have proposed that regions of space-time might naturally, or by human intervention, be made to curve back onto themselves. Someone moving around such a loop could travel back in time

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Time travel is so complicated. I'm sure somebody has already achieved it in the future and came back in time without us even knowing or perhaps we are not to temper with the past& future and God has found a way to stop us from creating a way to travel faster then the speed of light.