Eddington Number
From charlesreid1
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Arthur Eddington's estimate of the total number of protons in the observable universe:
$ N_{Edd} \approx 15,747,724,136,275,002,577,605,653,961,181,555,468,044,717,914,527,116,709,366,231,425,076,185,631,031,296 $
or,
$ N_{Edd} \approx 1.57 \times 10^{79} $