Comets ISON and Enke Enter STEREO Probe Field of View | Video

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As the possible 'comet of the century' (ISON) nears the Sun, it has come within the viewing range of the NASA Sun observing satellite. Earth, Mercury and the further away Comet Enke were all visible to the spacecraft on Nov. 21, 2013. (looped). All things ISON here:
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