Scientists unveiled evidence that gravitational waves, the ripples in the fabric of space-time predicted by Albert Einstein more than a century ago, are permeating the universe at low frequencies – creating a cosmic background hum.
Objects called pulsars – the extremely dense cores of exploded stars that spin at the speed of kitchen blenders – were crucial in the new research. Sixty-eight pulsars were used in gathering the evidence.
The gravitational wave signal was observed in 15 years’ worth of data obtained by the North American Nanohertz Observatory for Gravitational Waves Physics Frontiers Center , a collaboration of more than 190 scientists from the United States and Canada. Astronomers long have relied upon studying light to learn more about the cosmos, but that approach has limitations because it does not offer insight into many aspects of the universe. Gravitational waves allow for a more robust examination of the universe, as do ghostly subatomic particles called neutrinos.
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