Crossword puzzle clue "periods of time that can last for billions of years"

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Here are the possible solutions for periods of time that can last for billions of years clue

Answer
Clue
Relevancy
eons
Clue
Periods of time that can last for billions of years
Billions and billions of years
Definition
EON, a long period of time, also AEON
many
Clue
Billions and billions
Definition
a great number
sagan
Clue
Carl who said "billions and billions . . ."
"Billions and Billions" author Carl
"Billions and billions" astronomer
"Billions & Billions" author Carl
"Billions & Billions" author

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