of mass was converted into energy and carried away by the gravitational waves, LIGO scientists announced?June 15 in San Diego during a meeting of the American Astronomical Society,
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.
“Gravitational astronomy is real,
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,” LIGO laboratory executive director David Reitze said in a news conference. “The future is going to be full of binary black hole mergers for LIGO.”
A paper describing the finding was published online June 15 in Physical Review Letters. ?
As the two black holes spiraled around each other and slammed together, they churned up cosmic undulations that stretched and squeezed space — as predicted by Einstein’s general theory of relativity. These waves careened across the universe, reaching LIGO’s twin detectors in Hanford, Wash.,
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, and Livingston,
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, La.,
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, on December 26, 2015.
Each L-shaped LIGO detector senses the minuscule stretching and squeezing of space across its two 4-kilometer arms. As a gravitational wave passes through, one arm lengthens while the other shortens. Laser light bouncing back and forth in the arms serves as an ultrasensitive measuring stick that can pick up those subtle length changes (SN: 3/5/16, p. 22). As the gravitational waves rumbled past Earth in December,
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, they stretched and squeezed the arms by less than a thousandth the width of a proton. "That's very,
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, very small,
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,” González

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