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Re: dinosaur cloning and time travel

In a message dated 11/26/98 12:43:16 PM EST, znc14@TTACS.TTU.EDU writes:

<< I think we're getting just a little confused here. The atomic clock
 anecdote you mention was probably taken out of context. It probably referred
 originally to a relativity experiment, in which the aircraft with the atomic
 clock was going sufficiently faster than the clock on the surface that the
 time difference due to time compression (as predicted by Einstein) was
 observable. This is not time travel, in the conventional sense. >>

As I recall, what was measured was not the time dilation resulting from the
relative motion of frames of reference, but mainly the difference in time flow
resulting from the difference between the gravitational force at earth's
surface and aloft. A clock runs slower on earth than aloft because it lies
closer to earth's center of gravity; spacetime is slightly more curved at the
surface. This is known as "gravitational redshift." It is most extreme at the
event horizon of a black hole, where time stops completely.