PLES HELPPP M After studying the motions of the planets and stars for many years during the 1500s, the Polish astronomer Nicolaus Copernicus concluded that the Earth moved around the Sun rather than the opposite as was commonly believed. How did Copernicus' work affect the field of astronomy? OA. It led to the modern understanding of planetary motion. OB. It helped explain the various phases of the moon. OC. It led to the discovery of galaxies, including the Milky Way. OD. It proved to other scientists that the Earth was not flat. Am​