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What is the largest number in observable reality we know of with very high accuracy?
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March 3rd, 2010
He are a few candidates (subject matter experts please comment on accuracy):
Number of atoms in our universe: 10^80 +/- 10^78
Number of stars in our universe: 10^23 +/- 10^22
US national debt as of March 4, 2010 at 11 am: $12,514,506,202,842.88 +/- $ 1 billion
Age of the universe: 13.73 billion years +/- 120 million
Population of the Earth as of March 4, 2010 at 11 am: 6,806,200,321 billion +/- 1000
Age of the Earth: 4.54 billion years +/- 450 million
What other large numbers are well known? What about their accuracy?
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