On Sept. 14, 2015 at 5:51 a.m. EST, a very specific set of 40 kg mirrors moved in a very specific way — a distance thousands of times smaller than a proton — and humanity entered a new era. We spoke with David Reitze, executive director of the Laser Interferometer Gravitational-Wave Observatory (LIGO), about the technology that confirmed Albert Einstein's theory of ripples in spacetime.
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