Crossword puzzle clue "second of billions"

Here are the possible solutions for second of billions clue

Answer
Clue
Relevancy
eons
Clue
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
tons
Clue
Billions and billions

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