if we calculate the size of a black hole with mass and energy equal to all the mass and energy we can see in the Universe, we get a surprising result: it’s almost the same size of the observable Universe!
If this seems odd, remember that a black hole’s radius is directly proportional to its mass, while its volume is proportional to its radius cubed.
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[ 3.0 ms ] story [ 42.7 ms ] threadOr worse: it's black holes all the way down!
I suppose it depends on where you're standing.
so we are inside an object that we can observe looking outwards to the stars
if we calculate the size of a black hole with mass and energy equal to all the mass and energy we can see in the Universe, we get a surprising result: it’s almost the same size of the observable Universe!
If this seems odd, remember that a black hole’s radius is directly proportional to its mass, while its volume is proportional to its radius cubed.