Sagan's number, named after Carl Sagan, is the number of stars in the observable universe, currently estimated to be 70 sextillion or \(7 \times 10^{22}\).[1]
A related term, the sagan, is defined as four billion.[2]
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See also
Large numbers in science
Sagan's number · Avogadro's number · Eddington number · Planck units · Promaxima · Poincaré recurrence time · Universe size