The first confirmed heartbeat of a supermassive black hole is still going strong more than ten years after first being observed.

A black hole including the heartbeat signal observed in 2007 and 2018 [Credit: Dr Chichuan Jin,
 of the National Astronomical Observatories, Chinese Academy of Sciences and NASA/
Goddard Space Flight Center Conceptual Image Lab]

X-ray satellite observations spotted the repeated beat after its signal…

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Source: archeo