Galileo Galilei, Italian astronomer and physicist, 1635.
© Science Museum / Science & Society Picture Library
Portrait in oils by A S Zileri,1884, after an original by Sustermans of 1635, in the Uffizi Gallery, Florence. Italian astronomer and physicist Galileo Galilei (1564-1642) was one of the greatest scientists of all time. Galileo discovered Jupiter's moons and the laws governing falling bodies.