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One hundred years ago, Albert Einstein predicted the existence of ripples in the fabric of space called gravitational waves. He didn't believe we could ever hear them; he thought they'd be too quiet.

But scientists have just proven Einstein wrong a second time.

More than 1,000 physicists recorded the first gravitational waves on September 14, 2015, yet spent months confirming the unprecedented signal, officially announcing their discovery on February 11, 2016.

On Wednesday, the international collaboration announced its second-ever detection of gravitational waves - and the alluring signs of a third.

The researchers behind the huge experiment that found these events, called the Laser Interferometer Gravitational-Wave Observatory (LIGO), think two black holes collided to create the cosmic reverberations heard trillions of miles away on Earth.

 

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