The journey of astronomical telescopes began in the early 17th century when Galileo Galilei crafted his first refracting ...

contrary to the geocentric model favored by the Catholic Church, placed the Sun at the center of the cosmos. Despite facing backlash, Copernicus' work laid the foundation for modern astronomy ...

All the planets are far too close together ... Before the 17th century most people believed in a geocentric model of the solar system. Dallas explains the geocentric model and then the ...