The astronomer Carl Sagan, mentioned the dispute between the astronomical systems of Ptolemy (who thought that the sun and planets revolved around the earth) and Copernicus (who thought the earth and planets revolved around the sun). He states in ' that Ptolemy's belief was "supported by the church through the Dark Ages… effectively prevented the advance of astronomy for 1,500 years." Ted Peters in "Encyclopedia of Religion" writes that although there is some truth in this story, it has been exaggerated and has become "a modern myth perpetuated by those wishing to see warfare between science and religion who were allegedly persecuted by an atavistic and dogma-bound ecclesiastical authority". In 1992, the Catholic Church's seeming vindication of Galileo attracted much comment in the media.