The physicist Barry Barish (Omaha, USA, 1936), one of the main drivers of this extraordinary experiment, remembers perfectly what he was doing at that historical moment: “I was sleeping!” He says with a smile. “It was 2.50 in California so I was home. In Louisiana, where the signal was received, it was 4.50. In the LIGO scientific collaboration there are more than a thousand researchers spread all over the world and the first colleagues who saw it were in Germany, where it was already daylight “.

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