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One is the ion tail, the other the dust tail. Must be just the angle we're looking at it that they blend together for most of the tail's length. The ion tail is always straight and usually blue in colour. The dust tail lags behind and is white. If you can find some old pics of Hale-Bopp you'll see a much better example of that. Anyone is welcome to describe things better! Would be interested in know the particular geometry of the tail, anyway.
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