http://www.universetoday.com/2009/02/24/how-to-see-comet-lulin/
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On a sidenote, I find it fascinating that some comets have an "anti-tail" or ion tail in this one, that points in the opposite direction in which the comet is moving. You can see it in the above image as a bluish cloud on the right side of the comet. I wonder how that all works...
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