Galileo Galilei - Portrait by Jusus Sustermans (1636)
 
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Galileo Galilei - Portrait by Jusus Sustermans (1636)
 
 
 
 
Galileo Galilei - Portrait by Jusus Sustermans (1636).  The Italian scientist commonly known as Galileo (1564-1642) has been called the "father of modern observational astronomy."  He advocated a heliocentric theory of the universe, positing that the sun is at the center of the universe.
 
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