In 1887, Michelson and Morey failed in their experiments with the Michelson interferometer, which could not prove the existence of ether. Compared with the laser interferometer used by the Michelson interferometer and LIGO team, the two interferometers in today's device are basically the same in principle except for the sharp increase in sensitivity, and both use two mutually perpendicular optical arms. At that time, Michelson thought that only these two arms should be able to get interference images, thus proving the existence of ether. The experimenters who detected the gravitational wave accepted that the two vertical arms would not interfere with the rotation of the earth. Only the external light wave could make the two arms produce the optical aberration, thus obtaining the interference image. With the interference image, the existence of ether is proved.<br>
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