There already are black holes.
No one has ever visited a black hole.
Should Earth ever collide with a black hole, it would get destroyed.
Well, since nobody has ever been in a black hole....... what do you think?
No non-fiction person has ever gone into a black hole.
According to current theory, a black hole, if it exists, begins its life full,and nothing that falls into it ever leaves it.
No.
no i haven't
No,it is impossible
no the galaxy is way to big for a black hole to do much in fact we now know that there is a supermassive black hole in the center of our galaxy right now.
Yes. A black hole will stop consuming matter if there is no matter nearby to consume.
No.
Extremely unlikely.