(striking variable quasar)
3C 279 is a quasar, identified as such in the 1960s,
and is an optically violent variable quasar (OVV).
It has shown substantial activity
in visible light, ultraviolet, and X-rays,
is a bright gamma-ray source and
its jet shows superluminal motion.
It has been observed by the Event Horizon Telescope (EHT), both for calibration
of EHT M87 observations and for its own interest.
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