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Making Celestial Tracks
results when two comet particles impacted aerogel

This image shows the tracks left by two comet particles after they impacted the Stardust spacecraft's comet dust collector. The collector is made up of a low-density glass material called aerogel. Scientists have begun extracting comet particles from these and other similar tadpole-shaped tracks.

Image credit: NASA/JPL-Caltech/University of Washington

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