Mr Skeptic Posted April 10, 2009 Share Posted April 10, 2009 Suppose I wanted to make a black hole around myself (not fall into one, make one around me), just to see what it was like. Suppose I could move around the insane amounts of matter required to do so. The question is, what would that look like? Below is my proposal for how I might make a 1 light-year radius black hole around me: A total of 6.37 X 1042 kg of matter is required, and must be contained within a radius of 1 light year to form the black hole. See calculation, it uses the Schwarzschild radius equation. In my scenario, I arrange the 6.37 X 1042 kg of matter into little (relatively) spherical masses arranged symmetrically along a larger sphere of radius 1.1 light years and drop them. This way, most of the sky should be visible to me, and I have some time to watch the process start. I'm .5 light years from the center, watching. The masses should start falling and a black hole should form when the matter is contained in the 1 light year sphere. I know that for inverse square gravity, being inside a sphere of mass you would feel no force because it all cancels. Would this be true of GR gravity as well? Anyhow, in the above scenario, what would I see? Would I feel any forces? Would I even be able to notice when the black hole forms around me? Would I be able to observe the masses falling after the black hole forms? I know that eventually, the masses will fall past (in which case, I will definitely start falling) or on me, making being hit by a ton of bricks laughable in comparison. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted April 10, 2009 Share Posted April 10, 2009 Suppose I wanted to make a black hole around myself (not fall into one, make one around me), just to see what it was like. Suppose I could move around the insane amounts of matter required to do so. The question is, what would that look like? Below is my proposal for how I might make a 1 light-year radius black hole around me: A total of 6.37 X 1042 kg of matter is required, and must be contained within a radius of 1 light year to form the black hole. See calculation, it uses the Schwarzschild radius equation. In my scenario, I arrange the 6.37 X 1042 kg of matter into little (relatively) spherical masses arranged symmetrically along a larger sphere of radius 1.1 light years and drop them. This way, most of the sky should be visible to me, and I have some time to watch the process start. I'm .5 light years from the center, watching. The masses should start falling and a black hole should form when the matter is contained in the 1 light year sphere. I know that for inverse square gravity, being inside a sphere of mass you would feel no force because it all cancels. Would this be true of GR gravity as well? Anyhow, in the above scenario, what would I see? Would I feel any forces? Would I even be able to notice when the black hole forms around me? Would I be able to observe the masses falling after the black hole forms? I know that eventually, the masses will fall past (in which case, I will definitely start falling) or on me, making being hit by a ton of bricks laughable in comparison. I think it would look just as you describe. A comforting thought while you are watching it all is the Darwin Award you will likely receive. (they will probably just jettison it into the black hole in your honour) Link to comment Share on other sites More sharing options...
Mr Skeptic Posted April 14, 2009 Author Share Posted April 14, 2009 I think it would look just as you describe. What I described was the setup; I don't know what it would look like. And yes, it would earn me a Darwin Award, but the point is to make a thought experiment. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted April 15, 2009 Share Posted April 15, 2009 I think you would feel no force until the masses either hit you, or missed you whereas you would feel sudden and then increasing tidal forces leading to your spaghettification. I think you would see everything form as you describe, other than a increasing blueshift from the speed of the masses when the light leaves them. Nothing unusual would happen when the 1 light year radius was reached and as the black hole started to exist. Link to comment Share on other sites More sharing options...
alan2here Posted April 20, 2009 Share Posted April 20, 2009 Presumably there would be no gravertational issues, just no graverty, you could walk on the ultra-dence mass except you would try and end up pushing yourself and float away. What would happen temprolay would be more intresting. Link to comment Share on other sites More sharing options...
Megabrain Posted April 20, 2009 Share Posted April 20, 2009 If you Merged post follows: Consecutive posts mergedIf you want to find out what it's like to live in a black hole, move to Sheffield England, all that industrial revolution soot is still there! Link to comment Share on other sites More sharing options...
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