Quasar OJ287 is not wildly famous, but it is so bright that it can be seen even by amateur astronomers. Its brightness is due to the extremely active supermassive black hole at its center. But the black hole is not alone; it has a companion, as some intriguing, first-of-a-kind radio images have witnessed. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Active black holes can emit a jet of particles as they feed on material that surrounds them. The team behind these new images was finally able to distinguish the signature of not just one but two jets from the quasar , a hallmark sign of a second active black hole.

"For the first time, we managed to get an image of two black holes circling each other. In the image, the black holes are

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