Upper Bound for Number of Grains of Sand to fill Universe/Mistake

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Source Work

1986: David Wells: Curious and Interesting Numbers:

The Dictionary
$10^{51}$


1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary
$10^{51}$


Mistake

... the number of grains of sand required to fill the universe turns out to be, in our notation, less than $10^{51}$.


Other sources report it as $10^{63}$. It is not clear from where Wells sources his information.


Sources