Yes, and light is actually how the LIGO and similar detectors can measure such small changes in distance. Light emitted from a laser is split into two beams tra

Yes, and light is actually how the LIGO and similar detectors can measure such small changes in distance. Light emitted from a laser is split into two beams traveling different paths, and then merged back together. When the light merges back together, if the two paths traveled took exactly the same distance (or an even multiple of the wavelength at least), then the beams add together constructively and you put back together the light from the laser. But if one path becomes longer or shorter the other, the light is out of phase with itself (peaks of the waves no longer line up with each other) and you can detect the interference between them. LIGO can detect a change in distance of less than one ten-thousandth the charge diameter of a proton. https://en.wikipedia.org/wiki/LIGO#/media/File:Gravitational_wave_observatory_principle.svg https://en.wikipedia.org/wiki/LIGO#/media/File:Gravitational...