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by Abdullah on December 4th, 2009

Abdullah

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According to general relativity time is dimension !
Do you think we'll able to travel in this dimension??and how?

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  • by Christine on December 30th, 2010

    Christine

    We already travel forward, and can do so faster relative to everyone else by traveling faster in three dimensions.

    Traveling back in time does suggest a number of paradoxical scenarios. The original Terminator covers most of them. Consider the pipe bombs. Kyle Reese teaches Sarah Connor how to make them, but he learned it from John Connor who learned it from Sarah Connor. So where did the pipe bomb making knowledge really come from?

    The more obvious scenarios are the ones that involve changing the past. Terminator shows that time travel does not mean changing the past. (Well the first one does, the sequels are totally incoherent.)

    On the other hand, if there are five dimensions, then perhaps traveling backwards in time also involves moving in the fifth dimension. Consider Back to the Future. Marty McFly thinks he is changing the past to bring about a happier future, but in fact he is just moving from his miserable timeline to a happier timeline, the timeline where he showed up and changed things for the better. The timeline he left is the timeline where he did not show up in the past, and so it remains miserable in the present. In fact, it is probably even more miserable as that timeline now has to do without Marty McFly from then on. The happier timeline has two Marty McFlys, but the movie ends before anyone realizes there are two. (Or maybe the second one went back in time to another timeline and died.) Maybe the miserable timeline is miserable because in it, Marty McFly did go into the past, but died without affecting anything.

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