Galileo Galilei

Galileo di Vincenzo Bonaiuti de' Galilei (1564-1642) was an Italian astronomer, physicist, and engineer, sometimes described as a polymath. He has been called the 'father of observational astronomy,' the 'father of modern physics,' and the 'father of modern science.'

Born in Pisa, Galileo studied medicine before turning to mathematics and natural philosophy. His improvements to the telescope (1609) enabled observations that would revolutionize astronomy: the moons of Jupiter, the phases of Venus, sunspots, and the rough surface of the Moon.

These observations provided decisive evidence for the Copernican heliocentric model - the idea that the Earth orbits the Sun, not the other way around. This brought him into direct conflict with the Catholic Church, which maintained the geocentric model as doctrine.

In 1633, the Roman Inquisition found Galileo 'vehemently suspect of heresy' and sentenced him to house arrest for the remainder of his life. Legend has it that after his recantation, he muttered 'Eppur si muove' ('And yet it moves').

Beyond astronomy, Galileo made fundamental contributions to physics: the law of falling bodies, kinematics, the strength of materials, and the scientific method itself. His insistence on mathematical description and experimental verification laid the groundwork for all modern science.