Ladies and gentlemen, allow me to present the best-ever ultraviolet picture (at right) of our galactic neighbor, M31, aka the Andromeda Galaxy.Taken by NASA’s Swift satellite, which normally scans the skies for far-off gamma-ray bursts, this picture represents a total exposure time of just 24 hours, taken during late spring 2008. It merges 330 images taken by the satellite, showing a region 200,000 light-years wide by 100,000 light-years high (or 100 arcminutes by 50 arcminutes).The galaxy’s cen...