always been fascinated by the concept of time travel and still cannot see how it can ever be possible

imagine time as a river constantly flowing from the past to the future-forget the present because it does not exist-now time as a river which has tributaries so, in theory, "John" could be sent back along this tributary but would create another past and therefore another future in another universe-in other words, this person who has gone back has completely obliterated this universe and created another one

just suppose that "John" did travel back in time and died there-does this mean that he did not exist in the present?-but he must have done so to travel back in time-but he died in the past and so therefore he does not exist now-a paradox

the past has already happened be it one second ago or 5 millions years ago and the future is here and will continue to be here-my little human brain cannot comprehend how we can possibly change what has already happened or influence what will be because time is a constant-maybe a million years in the future, if we are still here, a group of scientists may have found a way to travel through time or there may be a race somewhere in our Universe a billion light years away who can already do so and are laughing at our feeble attempts to even work out the basics

dave

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