Comet dust reveals unexpected mixing of solar system

Chemical clues from a comet's halo are challenging common views about the history and evolution of the solar system and showing it may be more mixed-up than previously thought.

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<p><a href="http://www.physorg.com/news140965197.html">Comet dust reveals unexpected mixing of solar system</a></p> <p>Chemical clues from a comet's halo are challenging common views about the history and evolution of the solar system and showing it may be more mixed-up than previously thought.</p>