Gravitational waves, whose detection for the first time was announced yesterday, are ripples in spacetime, but their frequencies in some cases can be represented as audible sounds. A “chirp” was heard with the first wave detected, from two merging black holes, the scientists from the Laser Interferometer Gravitational-Wave Observatory (LIGO) facility that spotted the wave reported at the press conference Thursday. And that has inspired a #ChirpforLIGO hashtag where scientists are tweeting their own versions, The New York Times reports. The video above, produced before the announcement, collects many scientists’ chirps, including one in a clip from a past video by Carl Sagan.
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