ufofeed, https://www.ufofeed.com/75440/using-wobbling-stellar-material-astronomers-measure-the-spin-of-a-supermassive-black-hole-for-the-first-time/ Using wobbling stellar material, astronomers measure the spin of a supermassive black hole for the first time #Astrobiology #Astrophysics #Cosmology #PlanetaryScience #Space #SpaceExploration