For the first time ever, scientists can 'hear' the faint ripples caused by the motion of black holes that are gently stretching and squeezing everything in the universe.
predicted that when really heavy objects move through spacetime - the fabric of our universe - they create ripples that spread through that fabric. Scientists sometimes liken these ripples to the background music of the universe.
In the latest research, scientists were searching for waves at much lower frequencies. These slow ripples can take years or even decades to cycle up and down, and probably come from some of the biggest objects in our universe: supermassive black holes billions of times the mass of our sun. "Supermassive black hole binaries, slowly and calmly orbiting each other, are the tenors and bass of the cosmic opera," Marka said.
The scientists pointed telescopes at dead stars called pulsars, which send out flashes of radio waves as they spin around in space like lighthouses. "We now know that the universe is awash with gravitational waves," Michael Keith of the European Pulsar Timing Array told AFP.
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