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

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)
credit : NASA / STEREO