A new theorem predicts that stationary black holes must have at least one light ring

A new theorem predicts that stationary black holes must have at least one light ring
Black holes, regions in space with such an intense gravitational field that no matter or radiation can escape from them, are among the most mysterious and fascinating cosmological phenomena. Over the past five years or so, astrophysicists collected the first observations of the strong gravitational forces around black holes.
phys.org
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