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Neil deGrasse Tyson @neiltyson
.@bccxcc Yes, the atom-count in the observable universe is known. How about photons, you ask? Two billion times that number. — PolitiTweet.org
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Fri Jan 06 20:24:25 +0000 2012
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Likely AvailableNeil deGrasse Tyson @neiltyson
.@bccxcc Yes, the atom-count in the observable universe is known. How about photons, you ask? Two billion times that number. — PolitiTweet.org