1 min readComet Siding Spring (C/2013 A1)NASAOct 09, 2014 Image Article Comet Siding Spring (C/2013 A1) is racing toward Mars for a close encounter on October 19, 2014. Comet Siding Spring (C/2013 A1) is racing toward Mars for a close encounter on October 19, 2014.