(Sagittarius A*, Sgr A*)
(SMBH at the center of Milky Way)
Sag A* (more officially, Sgr A*) is the
supermassive black hole (SMBH) at the center of the Milky Way.
It is not active now, i.e., appreciable accretion is not
taking place. Its mass is 4.1 billion MSun. It
is an observation target of the Event Horizon Telescope (EHT), but has yet to be
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