Video: Two comets to fly by Mercury November 18 and 19

Desert Gypsy's picture - 11/14/13

Published on Nov 14, 2013

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Consider it a cosmic coincidence: On Nov. 18-19, two comets (ISON and Encke) are going to fly by the planet Mercury in quick succession. NASA's MESSENGER spacecraft will have a front-row seat for the rare double flyby.