How did Copernicus's work challenge the accepted view of the universe?A: he rejected Ptolemy's work altogether, theorizing that the earth was stationary and fixed orbits were not possible.B: he agreed with Ptolemy that the planets moved, but he did not believe they revolved around the earth. C: he wanted to prove that God created the universe and that science was not involved.D: he though that the universe had changed since Ptolemy's theory.