Comet ISON and Encke to Fly By Mercury on Nov 18 & 19 - NASA
- uploaded: Nov 19, 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 for breaking science news.