Describe two observations or discoveries that Galileo made that helped to prove the Copernicus heliocentric model of the Solar System, and began to cast doubt on the geocentric model.

Galileo was an Italian Astronomer and Physicist. He was regarded as the father of modern Physics and Father of Observational astronomy. He discovered four moons revolving around Jupiter.

He also knew that Venus is always closer to the Sun and that it had phases . He then said if truly it revolved around the Earth then those phases would be absent.

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