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Thread: black hole theory

  1. #1 black hole theory 
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    is it possible that black holes are actually ultra high density (not infinite), ultra low volume (not zero), bodies of matter? and .why shouldnt light be able to escape? these black holes are formed from the collapse of massive stars therefore they can have no more mass than the original star....light DID escape from the original star which had the same mass or more (less density) as the collapsed version. the gravitational "pull" of an object is determined by its mass not density correct?


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    The Doctor Quantime's Avatar
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    When mass reaches a certain distance from the center of mass (the schwarzchild radius) the space at the horizon is falling faster than the speed of light which is why light cannot escape, close to but not to far away from a black hole you can safely orbit and move away, its only closer you get where it gets dangerous and we have the space time effects due to the extremity of the black hole and the singularity at the center.


    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by tee45 View Post
    is it possible that black holes are actually ultra high density (not infinite), ultra low volume (not zero), bodies of matter?
    Strictly speaking, that is the singularity at the center of the black hole. The term 'black hole' really refers to the event horizon which has a radius proportional to the mass.

    As for the singularity, we don;t really know for sure. The only theory we current have (general relativity) predicts that matter will be compressed to zero size and infinite density. But this may just indicate that the theory doesn't really work under those conditions. We probably need a theory of quantum gravity to understand this.

    and .why shouldnt light be able to escape? these black holes are formed from the collapse of massive stars therefore they can have no more mass than the original star....light DID escape from the original star which had the same mass or more (less density) as the collapsed version. the gravitational "pull" of an object is determined by its mass not density correct?
    Actually, the strength of gravitational pull is determined by mass and distance. According to Newton's equation (still a useful approximation):

    So, as the radius of the star collapses the gravitational force at the surface increases. When it is so great that light (and, in fact, nothing) can escape then you have a black hole. This happens at the Schwarzschild radius.
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    ei incumbit probatio qui dicit, non qui negat
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    good question. matter x speed of light (2) is energy. i think if the energy is higher than the energy of light it cant escape. the big star has the same mass and gravity than the black hole but the black hole is more concentrated than the sun. all the energy is on a very small spot. steven hawking once said if you wanted to make a black hole out of earth you have to push it into the size of a peanut. than it would be strong enough to suck light in.
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