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 ...

Having read some of the recent reader opinion discussion debating heliocentrism and geocentrism, I feel I must offer an opinion. I feel eminently qualified to do so, as I once read a book almost to ...

When asked who was the first to propose the heliocentric theory—that is, the one in which the Sun is the center of the universe and the planets revolve around it—the usual answer is Copernicus.