Biography
Galileo Galilei turned the newly invented telescope to the sky in 1609 and changed astronomy forever. He found four moons circling Jupiter, mountains on the Moon, countless stars in the Milky Way, and the phases of Venus — direct evidence against the geocentric model. Condemned by the Inquisition in 1633, he is remembered as a founder of observational science.
Scientific contributions
- Pioneered telescopic astronomy (1609–1610)
- Discovered the four large moons of Jupiter
- Observed the phases of Venus, supporting heliocentrism
Major discoveries
Major publications
Observatories, instruments & objects
Knowledge connections
- DiscoveredIo
- DiscoveredEuropa
- DiscoveredGanymede
- DiscoveredCallisto
- Influenced byNicolaus Copernicus
- Part ofThe Scientific Revolution
- ObservedJupiter
- ObservedVenus
- ObservedThe Moon
- ObservedIo
- ObservedEuropa
- ObservedGanymede
- ObservedCallisto
- DiscoveredThe Galilean Moons of Jupiter
- DiscoveredThe Phases of Venus
- PublishedSidereus Nuncius
- PublishedDialogue Concerning the Two Chief World Systems
- Associated withInstrumentation-Driven Discovery
- Associated withThe Copernican Revolution
- Associated withThe History of the Telescope
Sources & references
The primary and reference sources this topic draws on.
- BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.
- IAUInternational Astronomical Union
Official naming, definitions, constellation boundaries, and astronomical nomenclature.