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A musing on time travel.
The argument has been made that if time travel were possible, we would have
seen time tourists by now. People hanging about at the tsunami high water
mark taking full-motion holography, recording the 2000 inauguration with their
pinkie rings, and generally converging on other natural disasters to mull
about and oggle.
It would seem that the universe's very presence would be sufficient argument
that (reverse) time travel will never be achieved. Were it to happen, you'd
eventually get to a point where the population of the universe had no universe
left in which to live - either due to the big crunch or heat death - and would
pick a time in their past in which to resettle.
Their progeny would repeat the process, and so on. Eventually, their combined
mass in any time would cause the universe to collapse in upon itself.
Maybe it will work out such that you have to replace an equal mass to your own
if you move to another time....
-rbarry
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