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Old 10-01-2019, 12:13 PM
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socratus socratus is offline
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Join Date: Aug 2011
Location: Israel
Posts: 452
June 4, 2014
How Big Are Black Holes?
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'' The largest black holes are called "supermassive."
These black holes have masses greater than 1 million suns
. . .
The supermassive black hole at the center of the
Milky Way galaxy is called Sagittarius A.
It has a mass equal to about 4 million suns . . .''

https://www.nasa.gov/audience/forstu...k-hole-58.html
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'' By absorbing other stars and merging with
other black holes, supermassive black holes of
millions of solar masses (M☉) may form.''
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From Primordial - "Micro black hole"
/ would have a mass >~ 10^-5 gram /
to Supermassive about 4 million suns . . . after big-bang . . .
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P.S.
Avogadro constant
https://en.wikipedia.org/wiki/Avogadro_constant
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