RT @RonBaalke: 2 years ago today (2014), Comet C/2013 A1 (Siding Spring) flew by Mars. MRO @HiRISE took this image of it. https://t.co/YhzjVBsd2K
RT @RonBaalke: 2 years ago today (2014), Comet C/2013 A1 (Siding Spring) flew by Mars. MRO @HiRISE took this image of it. https://t.co/YhzjVBsd2K