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@Dr.Grass

Ok I should have said you ente the Schwarzschild Radius from your own perspective. From outside it looks like that someone/something never enters. But the Schwarzschild Coordinates say time ends inside. Yeah with the Kruszal Coordinates you could have a white hole but can a conciousness possibly pass a black hole without dying if there would be a hypotetical white hole on the other side ? "You will certainly enter the black hole and be crushed" Not if you die before entering the Schwarzschild Radius. And i am not sure how to survive the forces around a black hole.

To the black hole passing in 1 Ly SURE SOMETHING WOULD HAPPEN IT WOULD STIR UP THE OORT CLOUD AND POSSIBLY SEND SOME COMETS IN THE INNER SOLARSYSTEM. But that wouldnt happen because it is a blackhole it would also happen if a Star passes through the oort cloud.

To the minimum mass of the black holes. I know they dont develop from small Stars like the sun. You think people now how much mass you need so a star collapses under its own gravity when the fusion stops ?

I havent written those posts for a physicist but posted them in a game forum. Black holes are no reason for fear they are no bigger threat to us then stars in general.