Supermassive binary black holes are thought to lie at the centres of merging galaxies. The blazar OJ 287 is the poster child of such systems, showing strong and periodic variability across the electromagnetic spectrum. A new study questions the physical origin of this variability.
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Abraham, Z. Jet precession in binary black holes. Nat Astron 2, 443–444 (2018). https://doi.org/10.1038/s41550-018-0484-2
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DOI: https://doi.org/10.1038/s41550-018-0484-2