People also underestimate how *enormous* and *empty* universe is. Black holes routinely exist at the center of galaxies and yet that doesn’t mean it’s eating its “host galaxy” all the time just waiting for it to be so large to start eating up another galaxy. Another galaxy might be hundreds of light years away and between that there’s *close to nothing*. I imagine even if a black hole would grow that big, it would run out of stuff to devour and slowly dissipate instead.
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