I don't remember the exact definition of a black hole, but i don't think physicists know everything about them. A very generalized description is that they are a relatively small thing with an immense gravitational field. The field is strong enough to pull light into it. I think that after some suns die out they like implode on themselves until they are a small particle with a very large gravitational field. But we don't know all the details since we still don't know everything about the cause of gravity.
... This is rehashed from past physics courses a few years ago, so there's a lot of cobwebs surrounding it but i think thats the basic jist.
Some people theorize that there is an extremely small black hole on earth. There is an area off the coast of Japan that is similar to the Bermuda Triangle and a line through the earth connecting them cuts right through the center of the earth. People think the weird shit surrounding the bermuda triangle is linked to a black hole
... Wow, I feel like a total nerd now...
A NEW HIGH SCORE! What does "high score" mean? New high score, is that bad? What does that mean? Did I break it?