said. “That's like changing the distance between Earth and the sun by a fraction of an atomic diameter."?This tiny deviation,
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, appearing in both detectors nearly simultaneously,
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, was enough to pick out the telltale ripples.
Compared with LIGO’s previously detected black hole merger,
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, this one was a more minor dustup. These black holes were less than half the size of those in the first merger (30 and 35 solar masses according to a recently revised estimate). And the signal of their coalescence was more subtle,
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, hiding under the messy wiggles in the data that result from random fluctuations or unwanted signals from the environment.

Chirp,
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, chirp


When converted into sound waves,
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, the gravitational waves from black hole mergers make a telltale “chirp” noise,
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, which crescendoes and increases in frequency as the black holes spiral inward. The most recent ripples registered in the detector for a full second ?– significantly longer than the two-tenths of a second seen in the first detection. This created a lengthier, drawn-out chirp. Here, the sounds from both gravitational wave observations are played,
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, followed by the same signals played at an artificially increased pitch to make them easier to hear.


LIGO



The first

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