Hints: far-off Andromeda quasar 1’04’处有一冒号(: )

The moment I could see that wiggle, so I knew essentially instantly that there was a very good chance this would be a supermassive black hole. When you see something like that, you know you are on to something.
They'd found evidence of the most terrifying force in nature. But worryingly it wasn't in some far-off active galaxy. This supermassive black hole was in the very ordinary galaxy right next door to us.
Andromeda seemed to have a black hole but no bright quasar.
If there was a supermassive black hole, why wasn't it shining? That suggested that there was not stuff falling in. Maybe lots of galaxies could have a dormant phase where they had a supermassive black hole but they weren't being fed so they weren't shining.
A few theorists had predicted this very thing: supermassive black holes could exist in two states.

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