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This is a set of frames of the surface of Comet 67P taken by the Rosetta mission on 1 June 2016. The particles in the foreground are bits of dust and ice or cosmic rays effects. The "waterfall" of points moving in the background are stars.

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Cosmic rays would create singular dots on the sensor that only appear for one frame. Given all the other streaks, it is hard to say if this video has that or not.