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reply to post by Bedlam
Your point is that repeated "Any thoughts?" is annoying?
reply to post by Bedlam
Radius of a Black Hole
The MIC sucks at times.
I swear, I could tell you when we get close because I start coughing on the plane somewhere over NTC on the way in.
I'm not sure how accurate black hole theory is (I think at best it's probably incomplete since we lack a theory of quantum gravity), but to the extent we think we understand them, we need to define the different types of radii. I'm not going to discuss them all because that will just unnecessarily confuse the issue.
They've actually measured the diameter of a black hole.
The radius may be undefined. At any rate, if the radius IS defined, then no, it doesn't have infinite density.
The horizon is not a physical surface, merely a conceptual one, and although it marks the point of no return for material plummeting toward the singularity, relativity says that nothing special happens there
At the center of a black hole as described by general relativity lies a gravitational singularity, a region where the spacetime curvature becomes infinite. For a non-rotating black hole, this region takes the shape of a single point and for a rotating black hole, it is smeared out to form a ring singularity lying in the plane of rotation. In both cases, the singular region has zero volume. It can also be shown that the singular region contains all the mass of the black hole solution. The singular region can thus be thought of as having infinite density.
The appearance of singularities in general relativity is commonly perceived as signaling the breakdown of the theory. This breakdown, however, is expected; it occurs in a situation where quantum effects should describe these actions, due to the extremely high density and therefore particle interactions. To date, it has not been possible to combine quantum and gravitational effects into a single theory, although there exist attempts to formulate such a theory of quantum gravity. It is generally expected that such a theory will not feature any singularities.
Dr. Comerford and her colleagues discovered a total of 33 pairs of supermassive black holes in distant galaxies. These discoveries are significant because “they show that dual supermassive black hole systems are much more common than previously known from observations,” says Dr. Comerford, who is a postdoctoral researcher in astrophysics at the University of California, Berkeley. The dual supermassive black hole pairs can in turn be used to estimate how often galaxies merge, and the team concludes that red galaxies from between 4 and 7 billions years ago underwent 3 mergers every billion years.