ParallaxNick is my favorite YouTube astronomy channel, his latest video is a quick one on the detection of the gravitational wave background.
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Gravity's song: the discovery of the gravitational wave background
https://youtu.be/Y-lY_Szi1-A
On June 23, 2023, a scientific collaboration spanning three continents announced the culmination of a 25-year search for gravitational waves within our galax...