Evidence for more dust than ice in comets

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Ejecta plume from Tempel 1, 13 seconds after impact
Observations of Comet 9P/Tempel 1 made by ESA’s Rosetta spacecraft after the Deep Impact collision suggest that comets are ‘icy dirtballs’, rather than ‘dirty snowballs’ as previously believed.


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All News summaries for October 13, 2005