Scientists may have heard the gravitational wave background or the resonant 'hum' that permeates the Universe for the first time. The sound has been detected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) and the findings have been published in the Astrophysical Journal Letters.

'Astronomical breakthrough': Scientists record humming sound of the Universe

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universe humming-sound

'Astronomical breakthrough': Scientists record humming sound of the Universe