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LIGO pioneers: Barish, Thorne and Weiss
From left: the 2017 Nobel Prize in Physics winners Barry Barish, Kip Thorne, and Rainer Weiss. Weiss's idea for a laser interferometer detector system, combined with Thorne's theoretical exploits and Barish's leadership in building the detector facilities - along with help from hundreds of scientists and engineers on the project - resulted in the first direct observation of gravitational waves in September 2015. Four such events have now been confirmed. Image: LIGO Laboratory.
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