Often and usually people think that time travel is not possible, but there is nothing that would prohibit traveling in time. Not even Einstein's theory of relativity, in any way, prohibit the idea of treveling in time. In fact, travelling in time has been done. Like I wrote in my recent post about the effects of time dilation. This, time dilation is closely related to time travel, that's not so sci-fi and has been experimentaly proven. But, the time travel I am going to write about this time is mainly about the "sci-fi" aspect, never the less, still with some scientific and theoretical background to it. So that it won't be just sci-fi... Anyway, the point is that time travel is possible in many ways.
As I said, time travel is possible in many ways, but there are major complications to it. Now I am not talking about the millionth of a millionth second "travelling" in time. Let's, for the sake of the lenght of this post, exclude the things I wrote about the real-life time travelling and concentrate to the theoretical aspects of time travel.
What time does for us is that it goes forward, no matter what we do, we can not stop or any other way control time. This is called the arrow of time, you can pour milk into your coffee, but you can not unpour the milk. Therefor the saying "what is done, is done" is pretty accurate. Theory of relativity says that time and space are linked to single consept called spacetime. Gravity bends space and therefore time too and so you could make the arrow of time into a circle, a infinite loop in time, to do this you would need the energy and superstrong gravity that would equal to a black hole. Nothing bends spacetime more that a black hole. So if you take a piece of paper, make two holes at the ends and fold the paper so that the two holes meet, this is what a black hole does to spacetime, so called wormhole. Where would this wormhole lead to? No one knows, maybe it leads to another dimension or just maybe to another time, future or past.
Let's say that we have a time machine, that lets us travel freely in time and you decide to travel back in time to meet your grandfather(this is called The Grandfather paradox) and suppose that your grandfather is going on a blind date with your grandmother, they have never met before. What would happen if you performed an action that caused your grand parents to never meet? How could you have then never be born and thus travel in time and so on? These kind of events that do not make sense are called paradoxes, they are gliches in the spacetime continuum. Most scientist believe that these paradoxes are not going to happen because the universe has a way of making sense, righting the wrong. Travelling backwards in time and causing a change in history would cause the universe to split into another timeline, thus universe would right the wrong and not cause a paradox in this timeline. Travelling forwards in time does not cause paradoxes, 'cause it has not happened yet, but still it has been proposed that it would cause this timeline to split.
There is this very interesting take on time travel, quantum theory was the catalyst. It is the idea that there are eight other dimensions in addition to our three dimensions. We can not see the other dimension because they are hidden from our view, humans are limited to see only in 3D. In the future, if there has been experimentaly proven to be other dimensions, maybe we could find a way to use those extra dimensions to travel in time and space. That's extremely wild idea, but not all that crazy. So, there you go! This was very difficult to write in terms of readability. There is so much material to time travel and it is so huge topic to cover thoroughly, but hope that somebody got something out of this:)
What time does for us is that it goes forward, no matter what we do, we can not stop or any other way control time. This is called the arrow of time, you can pour milk into your coffee, but you can not unpour the milk. Therefor the saying "what is done, is done" is pretty accurate. Theory of relativity says that time and space are linked to single consept called spacetime. Gravity bends space and therefore time too and so you could make the arrow of time into a circle, a infinite loop in time, to do this you would need the energy and superstrong gravity that would equal to a black hole. Nothing bends spacetime more that a black hole. So if you take a piece of paper, make two holes at the ends and fold the paper so that the two holes meet, this is what a black hole does to spacetime, so called wormhole. Where would this wormhole lead to? No one knows, maybe it leads to another dimension or just maybe to another time, future or past.
Let's say that we have a time machine, that lets us travel freely in time and you decide to travel back in time to meet your grandfather(this is called The Grandfather paradox) and suppose that your grandfather is going on a blind date with your grandmother, they have never met before. What would happen if you performed an action that caused your grand parents to never meet? How could you have then never be born and thus travel in time and so on? These kind of events that do not make sense are called paradoxes, they are gliches in the spacetime continuum. Most scientist believe that these paradoxes are not going to happen because the universe has a way of making sense, righting the wrong. Travelling backwards in time and causing a change in history would cause the universe to split into another timeline, thus universe would right the wrong and not cause a paradox in this timeline. Travelling forwards in time does not cause paradoxes, 'cause it has not happened yet, but still it has been proposed that it would cause this timeline to split.
There is this very interesting take on time travel, quantum theory was the catalyst. It is the idea that there are eight other dimensions in addition to our three dimensions. We can not see the other dimension because they are hidden from our view, humans are limited to see only in 3D. In the future, if there has been experimentaly proven to be other dimensions, maybe we could find a way to use those extra dimensions to travel in time and space. That's extremely wild idea, but not all that crazy. So, there you go! This was very difficult to write in terms of readability. There is so much material to time travel and it is so huge topic to cover thoroughly, but hope that somebody got something out of this:)
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