While he didn't invent the telescope, he significantly improved its design and used it to make groundbreaking astronomical observations:
* Phases of Venus: Galileo observed the phases of Venus, similar to the moon. This could only be explained if Venus orbited the sun, not the Earth.
* Moons of Jupiter: Galileo discovered four moons orbiting Jupiter, showing that not all celestial bodies revolved around the Earth.
* Sunspots: He observed sunspots, proving that the Sun was not perfect as previously thought.
* Craters on the Moon: Galileo's observations revealed that the moon wasn't a smooth, perfect sphere but had craters and mountains, challenging the traditional view of the heavens.
These observations provided strong evidence for the heliocentric model proposed by Nicolaus Copernicus, challenging the prevailing geocentric view that placed Earth at the center of the universe.
