Who said that in the universe every body exerts a gravitational force

1.	Who said that in the universe every body exerts a gravitational force on every other body?
A.	Einstein
B.	Irene Curie
C.	Sir Isaac Newton
D.	Galileo Galilei
Answer» D. Galileo Galilei

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Who said that in the universe every body exerts a gravitational force on every other body?

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