Comet C/2013 A1 (Siding Spring) will pass extremely close to Mars on Oct. 19, 2014. There is even a small possibility that it could impact the planet, although new tracking data has minimized this ... more 
Comet C/2013 A1 (Siding Spring) will pass extremely close to Mars on Oct. 19, 2014. There is even a small possibility that it could impact the planet, although new tracking data has minimized this prospect. less 
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SPACE.com | Photo By NASA/JPL
Mon, Apr 15, 2013 12:36 PM EDT