| So here's just my understanding using basic physics: That kind of gravitational pull can't come from nowhere. If you start from the smallest theoretically possible black hole of about 22 micrograms, it should have the gravitational pull of just that - 22 micrograms. Suppose it doesn't just immediately disappear, it won't even have gravitational pull to move a feather next to it. You could probably even start wadding the feather at it and it wouldn't do much to it, because I don't think that's enough force to even break it apart. If you put a grain of sand on a table you don't expect the gravitation of that grain of sand to break the table apart either. Maybe it'll manage to take in some surrounding air? But in that case you'd have all the time in the world to build a vacuum chamber around it - if you're worried. Likely the black hole would need to be extremely lucky for any (air) molecule to come close enough that it can pull it in, since it'll be a tiny thing in a sea of mostly nothing. In any case, I suppose that in reality the black hole would just dissipate quicker than it could take in mass - because black holes need a lot of new mass to keep going considering the amount of energy/mass they spit out. And only black holes made from a lot of matter (i.e. stars) appear to have the gravitational pull to feed themselves and stay alive, since that's all we can observe in nature. Anyways, that's just using a lot of basic physics that maybe don't even apply to black holes in that way. |
About the only information about theoretical small black holes was this quote: "But if you happened to turn the Eiffel Tower into a black hole, it would evaporate in only about a day. I don't know why you would, but there you go."[1]
[1]: https://public.nrao.edu/ask/the-life-cycle-of-a-black-hole/