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2014: A BIG YEAR FOR SMALL WORLDS Dwarf planets and comets take center stage this year. Two spacecraft are closing in on Ceres and Pluto. Another is preparing to land a probe on a comet. Here's a month-by-month guide to the action.

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Comet Siding Spring: October 2014
Near Miss With Mars!

NASA is paying cautious attention to a comet that could put on a barnstorming show at Mars on 19 Oct. 2014. On that date, comet C/2013 A1 Siding Spring will buzz Mars about 10 times closer than any identified comet has ever flown past Earth.

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