The motion of black holes and other massive objects can cause ripples in space-time – gravitational waves. Scientists now see evidence of a universal background of gravitational waves, created by supermassive black hole pairs swirling in space. https://go.nasa.gov/3PwynPD
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15 Years of Radio Data Reveals Evidence of Space-Time Murmur
Scientists have found evidence of a universal background of gravitational waves, or ripples in the fabric of space-time.NASA Jet Propulsion Laboratory (JPL)