How are scientists able to determine the distance size of
singularities within black holes?
The distance of a black hole is obtained the saem way as astronomers
would determine the distance from the star that preceded it. If it
is relatively close within our galaxy, then parallax might work, or a
redshift if it is a big black hole in a distant galaxy. I am sorry I
have no idea about the diameter of the singularity, except to suggest
that the single point has no diameter at all.
David H. Levy
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Update: June 2012