Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2013 September 26 M31 versus M33 Image Credit & Copyright: Rogelio Bernal Andreo (Deep Sky Colors) Explanation: Separated by about 14 degrees (28 Full Moons) in planet Earth's sky, spiral galaxies ..