Per- and polyfluoroalkyl substances (PFAS) are a family of chemicals that are persistent and ubiquitous in the environment. While perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS)…
General relativity predicts that light can enter into orbit around a black hole, producing photon rings. Analyzing images of the photon rings and the accretion disk of a black hole can thus give us a…