From mcnees@mastodon.social on Mastodon: Happy Rotating Black Hole Day! Roy Kerr submitted his breakthrough paper describing the spacetime around a rotating black hole # OTD in 1963. Physicists had been searching for decades for this solution to the field equations of Einstein's theory of general relativity. https:// journals.aps.org/prl/abstract/ 10.1103/PhysRevLett.11.237