Galileo Turns the Telescope to the Heavens
In 1608 a Dutch spectacle-maker (Hans Lipperhey) invented an instrument that made distant objects appear closer. Galileo Galilei, professor at Padua, immediately grasped its potential and built an improved version. Between November 1609 and January 1610, he made a series of revolutionary observations: the Moon's surface was mountainous, not a perfect sphere (contradicting Aristotelian perfection of the heavens); Jupiter had four moons orbiting it (proving not everything orbited the Earth); Venus showed phases like the Moon (proving it orbited the Sun, not the Earth); the Milky Way was composed of countless individual stars. Galileo published these findings in Sidereus Nuncius ('Starry Messenger') in March 1610. The book made him instantly famous across Europe and secured him a position at the Medici court. His subsequent championing of Copernicanism led to his trial before the Inquisition (1633), where he was forced to recant and spent his last years under house arrest. His defiance of authority in favour of empirical evidence made him the symbol of the conflict between science and religious dogma.
- Year: 1609 CE
- Category: Scientific
