New Calculations Effectively Rule Out Comet Impacting Mars in 2014

NASA's Near-Earth Object Office says that new observations of comet C/2013 A1 (Siding Spring) have allowed further refinements the comet's orbit, helping to determine the chances it could hit Mars in October of 2014. Shortly after its discovery in December 2012 astronomers thought there was an outside chance that a newly discovered comet might be