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Yes that's right. As I understand it, as stars burn their fuel they eventually get to a point where they can no longer sustain their size and will begin to collapse in on themselves due to gravity. If the star was originally big enough it will collapse down to a black hole. Our sun won't do that.
However I think this only describes the density of the object the mass still remains the same. That means the gravitational effect of the black hole is no different from the original star. What will happen though is the immediate area of spacetime around the hole becomes so bent that anything moving into it (past its event horizon) cannot escape. The size of that area depends on how big the original star was.
Anything can be made into a black hole. If we could artificially compress the sun enough we could turn it into a black hole. But it would be small. We would still be out side its event horizon and the gravitational effect on us would remain the same. What would kill us is the loss of the sun's energy.
So a roving black hole is just as dangerous as any other roving massive object, we just might not see it coming. Just as well the distances are huge.
Regards, Shane
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