text:   Advanced LIGO and Advanced Virgo's first three observing runs",3,"['A paper published today on @arxiv by the Virgo, @LIGO  and @KAGRA_PR Collaborations, based on data from the first three observing runs of the Virgo and LIGO detectors, sets new constraints on anisotropies of stochastic gravitational wave backgrounds. <LINK> <LINK>', 'Different GW backgrounds are generated from the combination of all the too faint merger signals, that our detectors are not able to individually resolve, or from early Universe phenomena, such as phase transitions and primordial black hole mergers. Hence observing...', ""direction-dependent features in the GW backgrounds could give us insights into history of the early universe and matter distribution of the nearby one. This research didn't find any significant evidence for a gravitational-wave background, but it sets more stringent upper limits.""]",21,03,812