I read an article on LIGO, and I heard it mentioned that it is a nontrivial argument to say that the effect can be measured by interferometry. What happens to space as the wave passes? Does the light change wavelength due to the space that it is traveling through expanding? or does it keep its original wavelength according to a reference frame unaffected by the wave?
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I want to know what happens to the space a black hole crosses over as our galaxy travels through space.
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