Enlarge / This is the first image of Sgr A*, the supermassive black hole at the center of our galaxy. It’s the first direct visual evidence of the presence of this black hole. It was captured by the Event Horizon Telescope (EHT).EHT Collaboration
It’s probably not realistic to call a supermassive black hole “quiet.” But, as far as these things go, the one at the center of our galaxy is pretty quiet. Yes, it emits enough energy that we can image it, and it occasionally gets a bit more active as it rips something nearby to shreds. But supermassive black
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