#CometISON entered the field of view of the HI-1 camera on NASA's Solar Terrestrial Relations Observatory...

#CometISON entered the field of view of the HI-1 camera on NASA's Solar Terrestrial Relations Observatory, or STEREO, on Nov. 21, 2013, and the comet shows up clearly, appearing to still be intact.

Dark "clouds" coming from the right are more dense areas in the solar wind, causing ripples in Comet Encke's tail. Using comet tails as tracers can provide valuable data about solar wind conditions near the sun.

Image Credit: Karl Battams/NASA/STEREO/CIOC #ISON #comet