Crossword puzzle clue "carl who said billions and billions"

Here are the possible solutions for carl who said billions and billions clue

Answer
Clue
Relevancy
sagan
Clue
Carl who said "billions and billions . . ."
"Billions and Billions" author Carl
"Billions & Billions" author Carl
"Billions and billions" astronomer
"Billions & Billions" author
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
tons
Clue
Billions and billions

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