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HRI image of ice particle cloud morphing from the out of focus (undeconvolved) to deconvolved (sharpened) view.
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The before and after still images used to make the animation.
Caption: This zoomed in image from the High Resolution Instrument shows particles swirling in a "snow storm" around the nucleus of comet Hartley 2. From these images we can estimate the size of the particles and we use a combination of other data to determine that these are icy particles rather than dust. Although the largest particles are golfball to basketball sized, they are very porous and fluffy.