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Hi Alex,
As far as I know it's very real and very observable and has been proved using such tools as satellites and atomic clocks, and I think more recently by somehow measuring lasers via spectroscopy. Don't ask me about the actual experiments though as I don't know much about the details. I'm guessing there's been a number of experiments over the years.
And yep, each observer will see things relative to his frame of reference.
Cheers,
Andrew.
Last edited by AGarvin; 30-05-2006 at 09:30 PM.
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