A Google Doodle today celebrates Nicolaus Copernicus, the Renaissance astronomer who pushed forward the (at the time) radical idea that Earth wasn't the center of the universe. Instead, he theorized ...

Add Yahoo as a preferred source to see more of our stories on Google. Galileo, Kepler and Copernicus with planets and orbital diagrams. In this series, The Week looks at the ideas and innovations that ...

Seleucus of Seleucia was an ancient astronomer who defended heliocentrism, arguing that Earth orbits the Sun and rotates on ...

This story is a collaboration with Biography.com. Nicolaus Copernicus developed a celestial model of a heliocentric planetary system, which he described in his landmark work De revolutionibus orbium ...

Known as the father of modern astronomy, Nicolaus Copernicus inspires us with today’s quote of the day. Learn the quote of ...

Web giant celebrates the 540th birthday of the astronomer best known for his theory that the sun -- and not the Earth -- was at the center of the universe. Steven Musil is a senior news editor at CNET ...

Ibn-al-shatir's lunar model from which Copernicus is reported to have borrowed in composing his cosmological model. Credit: This work is in the public domain in the United States. New research has ...