Well-defined Numbers That Are Not Precisely Known
Sagan's number is the number of stars in the observable universe. It is named in honor of Carl Sagan. This number is reasonably well defined, since we know what stars are and what the observable universe is, but its value is not known with any certainty (it is presently estimated to be approximately 70 sextillion (short scale)).
Sagan's number is unrelated to the bogus sagan unit or the humorous use of the term "sagan" to denote any large quantity.
Read more about this topic: Indefinite And Fictitious Large Numbers
Famous quotes containing the words numbers and/or precisely:
“Green grow the rushes-O
What is your one-O?”
—Unknown. Carol of the Numbers (l. 2–3)
“I am absent altogether too much to be a suitable instructor for a law-student. When a man has reached the age that Mr. Widner has, and has already been doing for himself, my judgment is, that he reads the books for himself without an instructor. That is precisely the way I came to the law.”
—Abraham Lincoln (1809–1865)