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comet ison

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    Comet C/2012 S1 (ISON)

    I have a couple questions re. Comet ISON a) The green ion tail is apparently due to cyanogen and diatomic carbon; what does this mean? Does this give any indication of where it's come from in the solar system? b) At it's perihelion it will be around 1 degree from the sun (from the observer's...
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