I didn't understand how a black hole could pass through a star when I read this. I think of black holes as large. Apparently a primordial black hole can have th

I didn't understand how a black hole could pass through a star when I read this. I think of black holes as large. Apparently a primordial black hole can have the mass of an asteroid compressed into a space smaller than a proton. I also thought very small black holes evaporated quickly via Hawking radiation. I was wrong on the scale there too. A PBH with the mass of an asteroid can easily live for longer than the universe has been around. Something about the very very early universe let matter collapse into these things without the normal processes that form stellar sized black holes.