Longtime image contributor Jamie Cooper from Dustin, England, sent in this image of Comet PANSTARRS as it passed the Andromeda Galaxy (M31) on April 3. He used a Canon 5D Mark II DSLR and a 100-400mm zoom lens set to 250mm and f/4. After setting his camera to ISO 1600, he took nineteen 30-second exposures and stacked them.