ligo’s hanford observatory, one of 2 main facilities used by ligo to detect ‘ripples’ or gravitational waves in space-time. both of the observatories have an enormous l-shaped interferometer, each arm measuring 4km in length, with a mirror at each end. laser light enters the ‘arms’ from the corner of the l-shape and then bounces back and forth between each mirror a set number of times. the reason for this is better explained in the clip below.
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