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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

Boulder CO (SPX) Jun 21, 2023 - Near the center of the Milky Way Galaxy sits an immense object that astronomers call Sagittarius A*. This supermassive black hole may have grown in tandem with our galaxy, and it's not alone. Scie

Strange signal detected that may be from a gravitational wave, cosmic string -- galaxy-sized filament of raw energy-- or primordial black hole.

  In 1993 Stephen Hawking proposed in Black Holes and Baby Universes that there might be “primordial black holes which were formed in the early universe that could be less than the size of the nucleus of an atom, yet their mass could be a billion tons, the mass of Mount Fuji. A black hole weighing a billion tons,” Hawking explained, “would have a radius of about 10-13 centimeter (the size of a neutron or a proton). It could be in orbit either around the sun or around the center of the galaxy, emitting hard gamma rays with an energy of about 100 million electron volts.”