Definition
Galileo Galilei was an Italian polymath: an astronomer, physicist, and engineer whose observations revolutionized our understanding of the cosmos. He championed the heliocentric model, stating the Earth revolves around the Sun, not vice versa. Think of him as the ultimate science YouTuber, making mind-blowing discoveries. His use of the telescope allowed him to observe celestial bodies like never before. His stance against geocentrism led to conflict with the Catholic Church. He laid the foundation for modern physics and astronomy.