Ok lets assume that our sun suddenly turned into a black hole. (I know its not possible, so don't tell me so.) Because the location of the sun does not change it just centerizes to marble. How far would the event horizion (the point of no return) extend out. Past mercury, 2 inches?
2006-08-05
10:40:05
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13 answers
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asked by
Darth Futuza
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in
Science & Mathematics
➔ Astronomy & Space
By the marble part I meant that the sun-blackhole would in size actually be about the size of a marble.
(BTW: I already know that stuff WONT fall in because the sun's gravity pull does NOT increase blackhole or not. However stuff MIGHT fall in if the event horizion was larger [it is because the black hole is so much more condenssed that its gravitational pull is increased 100fold when you are right next to it then if you were right next to the sun.]
2006-08-08
05:17:07 ·
update #1
The Schwarzchild radius of a black hole with mass the same as the sun is about 1.5 kilometers, or a bit under a mile. Twice the Scwarzchild radius is the radius of the coordinate singularity called the event horizon. The previous poster shouldn't have taken a square root of the 3000m.
2006-08-05 11:29:40
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answer #1
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answered by mathematician 7
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I don't understand the "marble" question. As for the rest, the event horizon would not extend very far. The black hole that represents where the sun was would be smaller than the size of the earth. So, maybe about 8000 miles out from the center of the black hole. Interestingly, it's mass would still be roughly the same as the sun's, so the frozen Earth would pretty much still orbit the black hole at the same distance it is now. The stuff falling in, by the way, is called an accretion disk. Not much stuff falling in, in this scenario, so I don't think there would be the tell-tale accretion disk around this particular black hole.
2006-08-05 22:58:58
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answer #2
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answered by Anonymous
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In all honesty, would it matter where that fine line ended..
I love sitting up late at night on some evenings, and having these sort of discussions.. and some far fetched ones as well..
how far down does the sand in the dessert actually go down.. has anyone ever dug that deeply.. etc.
But back to your question.. Say you were right in your estimation.. with all the damage that would occur, would earth or one of the other planets in our solar system, suddenly become a sun.. would anyone really know for certain either yes or no..
is there really life going on in the center of mars..
Remember the movie H.G.Wells, and his time traveler.. recall the people living above, and those below.. the street people we have now, most of them live below.. are we headed in the direction of the movie.. etc..
2006-08-05 17:51:03
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answer #3
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answered by sassy 6
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I don't have any calculations, but;
The sun is a relatively small star. I would guess the horizon would be between the orbits of mercury and venus. A red giant (that usually predates black holes) would have an event horizon out past jupiter.
2006-08-05 17:45:32
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answer #4
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answered by Pancakes 7
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Since, for a given mass (M) and distance (r) from the center of that mass, the escape velocity is given by:
v = sqrt(2*G*M/r)
where G is the gravitational constant (6.674*10^-11 Nm^2/kg^2).
You want the value of r that makes v = c = 3*10^8 m/s
Since the mass of the Sun is about 1.989*10^30 kg. it's pretty easy to calculate that r = 54.31 meters
Doug
2006-08-05 17:58:45
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answer #5
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answered by doug_donaghue 7
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Presuming your premise is possible...
And it is not...
But assuming our sun suddenly contracted down in size
until it became a black hole...
It would still be of the same mass as our sun so the
orbits of the plants would not be affected...
2006-08-05 17:50:12
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answer #6
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answered by Anonymous
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With the amount of gravity that a singularity produces, one the size our sun would make I would assume to have a event horizon to about earth.
The longer it feeds the larger the event horizon would be.
2006-08-05 17:43:48
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answer #7
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answered by Biker 6
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Well, even though you said you don't want us to tell you it isn't possible, I'm afraid the calculations cannot be made without knowing the appropriate mass and rotational period of the "black hole".
I couldn't do the calculations myself, I just know you need a realistic set of values to determine this.
2006-08-05 17:43:54
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answer #8
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answered by powhound 7
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what????
That "?" doesn't make sense... and yes... it can turn into a black hole... not any time soon though.
and... umm the location of the sun does change... I know the planets revolve aroun it and all... but the sun and planets are all moving through space
2006-08-05 17:44:20
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answer #9
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answered by Peter M 3
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Yes
2006-08-05 17:44:04
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answer #10
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answered by adamtosman 3
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