The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured views of comet C/2013 A1 Siding Spring while that visitor sped past Mars on Sunday (Oct. 19), yielding information about its nucleus.<img src="http://feeds.feedburner.com/~r/sciencedaily/~4/lEBnvzJecfs" height="1" width="1"/>
