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Milan Vojnovic
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A question from a physics laymen to those more advanced: if eLIGO detects gravitational waves by the difference to the combined laser wavelengths (a difference to the destructive interference pattern following curvature of space-time in each individual pathway), how is it that the lasers themselves are not exposed to a stretching of time, rather than spatial lengthening alone, since EM waves are, too, subject to gravitational waves? Would this not cause the pattern to remain the same if there really is a gravitational wave? Thank you for your time.