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first European to make regular observations of the heavens with a telescope; discovered mountains on the Moon, 4 moons revolving around Jupiter and sunspots; he discovered that heavenly bodies were not pure orbs of light but were composed of material substance; he was ordered by the Catholic Church to abandon the Copernican system

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1. first European to make regular observations of the heavens with a telescope; discovered mountains on the Moon, 4 moons revolving around Jupiter and sunspots; he discovered that heavenly bodies were not pure orbs of light but were composed of material substance; he was ordered by the Catholic Church to abandon the Copernican system
Image: Galileo Galilei





 
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