Astrophysicists report solid evidence for a background hum of gravitational waves

Astrophysicists have found the best evidence yet for a low-frequency “hum” of gravitational waves rippling through the cosmos, based on 15 years’ worth of ultra-precise measurements checking the timing of radio pulses from distant stars. The evidence, newly published in the Astrophysical Journal Letters, comes from several teams of researchers working in the U.S. and Canada as well as Europe, India, Australia and China. The teams monitored radio emissions from a total of 115 ultra-dense, spinnin

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