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Re: “Gravity and Light

Thanks for this, Don. If both the wavelength and the space between the mirrors are equally stretched, how is it possible to detect anything? Heres my understanding. Its true that the laser beams actually in the LIGO tubes at the moment the gravity wave starts coming through the apparatus see nothing unusual. But gravity waves vibrate about 100 times per second, much slower than the laser light, so fresh light coming into the already-stretched tubes has to travel fartherand its that fresh light that detects the passing gravity wave.

Posted by barryevans on 11/05/2017 at 1:46 PM

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