Not to be outdone by the feisty Opportunity Rover, the HiRISE camera on NASA’s Mars Reconnaissance Orbiter (MRO) turned in its homework this evening with a fine image of comet C/2013 Siding Spring taken during closest approach on October 19. The highest-resolution images were acquired by HiRISE at the minimum distance of 85,750 miles (138,000 … Continue reading "MRO Spies Tiny, Bright Nucleus During Comet Flyby of Mars"