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Originally posted by Illustronic
reply to post by 31Bravo
There can't be a black hole in our solar system because at that point the solar system would not exist. A star would have to be 10 to 20 times more massive than our sun to ever become a black hole, a black hole would have to come from somewhere, so we would see the effects of our neighborhood stars long before it would effect our sun. Lots of the tens of twenty nearest stars are less massive than our sun.
A lot of scenarios could take place in the short term depending on where the planets are in respect to the black hole's gravity overcoming the sun's, planets would either be ejected, orbit the black hole (doubtful), or fall into the hole, but most likely the solar system would be destroyed, as eventually the sun as well.
Because it seemed relevant for GLAST—not to mention fun—we tried to figure out where the nearest primordial braneworld black holes might be. We were startled to realize that they would be right in our backyard, astronomically speaking: If they make up 1 percent of the dark matter in the universe, thousands of tiny black holes may lie within our solar system! Our immediate reaction was, "No, that can't be. If black holes exist in the solar system, surely we would know." Actually, maybe not. The gravity from these black holes is not very strong; you could add a few thousand of them to the solar system without really changing the planets' orbits. You would need to get within 12 feet of one of these black holes to feel as much gravity as you normally feel here on Earth. So your neighbors could have a pet black hole, and you might not realize it. Not that they could hold onto it: as far as we know, miniature black holes would not experience the atomic forces that make matter solid, so they would pass right through the planet.