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Radio telescopes around the world picked up a telltale hum reverberating across the cosmos, most likely from supermassive black holes merging in the early universe.
A 15-year study has revealed the cosmic background noise of gravitational waves echoing across the universe for the first time.
Gravitational waves, ripples in the fabric of time-space predicted by Albert Einstein more than a century ago, are permeating the universe at low frequencies, according to a multiyear National Science Foundation project led by Oregon State University scientists.
An international collaboration, including researchers from CU Boulder, has for the first time uncovered compelling evidence of what scientists call the "gravitational wave background"—enormous undulations in the fabric of space and time.
The results are the first evidence of the gravitational wave background, a hum of spacetime ripples that pervades the Universe.