Lasers run the length of every arm, completely calibrated to combine in tune with each other, until one arm abruptly turns into slightly shorter or longer than the other – as would only occur if the universe itself is rippling. The neutron star merger is also the closest signal to be detected by gravitational waves, and the closest gamma-ray burst – solely about million mild-years away, versus the first black gap merger, which was greater than a billion gentle-years away.
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