Is Time Travel Possible?
By Tom Brown
"Conventional" time travel to the past is impossible because it will always result in a contradiction of logic. Just as the simple example if I can go back in time and assassinate my grandmother, do I or don't I exist? There is nothing to argue about the problem is glaring and cannot be ignored or overcome.
However there is no problem like this when travelling back in time purely as an observer, you can see reality around you but cannot influence it in any way, at all. There is no problem with that kind of paradox here and that goes for spatial travel also. Not to say it is indeed possible.
Of course if such a machine were built which actually works then there could be no thing can be hidden you must be very careful what you do in secret! Truly, truth always comes out! Like a river always heads for the sea.
There isn't a problem with conventional travelling to the future in fact it has to be otherwise the theory of relativity would not work.
Therefore in principle the future cannot be known it is always uncertain, although future events can be planned and the course of events steered, the future in itself may be altered.
In turn one might say the past (as history) cannot be changed and not influenced in any way but it may be known, as fixed.
One or the other you cannot have both.