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-Correct me if I'm wrong, but stopping a supernova by creating a black hole is insanely stupid. Wouldn't a black hole be much worse, what with radiation emissions and immense gravitation pull?
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At a distance, black holes have the same gravitational effects as would something of the same mass. (In this case, the star going supernova and the black hole would have nearly the same mass. Because the star is most of the mass of the black hole.) It is only when you are close to the event horizon that there is an apparent difference.
Black holes do not actually emit dangerous radiation. That is a result of matter spiraling into the black hole, causing it to heat up and emit radiation. That matter takes time to accumulate.
Jam it back in, in the dark.
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