A recent study conducted by an international team of astronomers sheds light on the behavior of a nearby blazar named BL Lacertae. The study, which was published in the journal Nature Astronomy, revealed that BL Lacertae is likely to be a binary black hole system that flickers in brightness due to a stream of material moving between the two black holes. This stream of material is thought to be responsible for the blazar’s intense light output and its variability. This discovery adds to the growing body of evidence that suggests many blazars are actually binary black hole systems, and further confirms the importance of studying these mysterious objects.

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source: Phys.org