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Sagan's number
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English
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Etymology
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Named in honor of
Carl Sagan
.
Proper noun
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Sagan
's
number
(
astronomy
)
The total number of
stars
in the
observable
universe
, often estimated to be in the
sextillions
.
Categories
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English lemmas
English proper nouns
English uncountable nouns
English multiword terms
en:Astronomy
English eponyms
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