A scientist with the U.S. National Science Foundation says an all-star international team of astrophysicists used a newly upgraded and excruciatingly sensitive $1.1 billion instrument known as the Laser Interferometer Gravitational-Wave Observatory, or LIGO, to detect a gravitational wave from the distant crash of two black holes, one of the ways these ripples are created.
Scientists discusses how proof of gravitational waves was discovered
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