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Ismael Bullialdus
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Ismael Bullialdus

Ismael Bullialdus (Boulliaud, Boulliau) (September 28, 1605 - November 25, 1694) was a French astronomer.

Born in Loudun, Vienne, France.

In 1640, he suggested that gravitational force follows an inverse-square law.

He died in Paris, France.

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