PASADENA, Calif., July 25 (UPI) -- Comet C/2013 A1 Siding Spring won't whiz by Mars for another two-plus months, but NASA is already preparing its Mars orbiters for the flyby.
Currently, NASA has two observation craft circling the Martian planet. A third will arrive just a month prior to the arrival of Comet C/2013 A1.