Le collaborazioni LIGO e Virgo scrivono sulle Physical Review Letters: GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2 We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10?11:58.6 UTC by the twin… Continua a leggere E tre!