Mars vs. Comet in 2014: Scientists Prepare for Red Planet Sky Show

Mars vs. Comet in 2014: Scientists Prepare for Red Planet Sky Show - Yahoo! News: "A close encounter between Mars and Comet C/2013 A1 (Siding Spring) in 2014 is creating both opportunity and anxiety in scientific circles. Scientists are in the early stages of assembling a comet-watching campaign that uses a spacecraft currently orbiting the Red Planet, as well as rovers on the Martian surface."