Protons in the Universe !

Astronomer Sir Arthur Eddington estimated that there are 15,747,724,,136,257,002,577,605,653,961,181,555,468,044,717,914,,527,116,709,366,231,425,076,185,631,031,296 protons in the Universe.
It was an ambitious thing to guess.
And he was wrong !

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