Others have already discussed the speed of light issues, so I won't go there. On the other hand, even if we did end up with a Black Hole on Earth, it wouldn't necessarily be dangerous. Please note that all of this is current generally accepted theory. Even then I'm a bit rusty so anyone who wants to can jump in and correct me.
It is true that in current theory, light can't escape from a black hole, and what goes on in there can be pretty weird. But all of this happens inside the event horizon. The key is how far out the event horizon goes.
Black holes can be of any mass. But contrary to popular belief, if our Sun ever turned into a black hole (which it won't), we wouldn't die from being sucked into it. Instead, we would die from lack of energy coming from the Sun to keep us warm, and give us light. The Earth would still continue to orbit the Sun just as it always has, as long as the Sun was the same mass, since the forces (where the Earth is) would remain the same. ie. Outside the event horizon, gravitation forces stay the same as they would be if it wasn't a black hole.
Now with regard to that bit up there where I said that black holes can have any mass. Because you usualy need a really massive star to go supernova before a black hole forms, a lot of people get the impression that lots of mass is needed. This mass is really just a trigger level for dying stars, but in theory the final mass of a black hole can be any amount.
It would in fact be theoreically possible to make a black hole from the Earth. To do this would require compressing all the matter of the Earth into a very small space. I think with the Earth's mass, this works out to be about 1cm. (Less than half an inch.) This is because 1cm is the Earth's event horizon. If all the matter is inside it pulling in, nothing can escape. But it isn't.
If anyone managed to create a black hole somewhere on Earth, they only have a minutely tiny amount of matter to work with. Likely it would have an almost unmeasurable event horizon. We might need to contain it in a special jar, but it's detructive potential wouldn't be massive. It would be hard enough for it's ordinary gravitational range to have an effect on anything, let alone getting something within it's event horizon.
This whole theory could be completely changed within a few years following future discoveries. Things like that always happen in science, which is why it's so interesting.
jesterzog Fight the light
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