Infrared scans of Comet Hartley 2 by NASA's EPOXI mission spacecraft show carbon dioxide, dust, and ice being distributed in a similar way and emanating from apparently the same locations on the nucleus. Water vapor, however, has a different distribution implying a different source region and process.
These maps were made from data obtained by the High-Resolution Imager on November 4, 2010.
Photo credit: NASA/JPL-Caltech/UMD
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