Black hole size
Name: Eileen B, Kewi A Ebersole
How big is a black hole?
A black hole can be any size. The heavier it is, the bigger. For a black
hole of the size of a star, I think the size is around 1 kilometer (if the
MASS is that of a star, that is). For a black hole with billions of stars
in mass, the size would be billions of kilometers.
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Update: June 2012