In a message dated 10/30/00 1:28:58 PM, email@example.com writes:
>There have been a bunch of physics articles about time machines over the
>few decades. They clearly show that time machines are not logically
>impossible, though it is not yet clear whether or not they are physically
>possible with standard physics. Here's one reference:
Yes, but the proposed time travel models do not allow the past to be
*changed*. If a future event causally affects a past event, that past
event was always altered. It's similar to a micro-time-travel
model that Hawking used for predictions on black hole radiation .
The current models agreed that changing the past creates paradox,
and demonstrated that in certain limited worlds you could have time
travel that didn't change the past.
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