JOHN CHUMACK / SCIENCE PHOTO LIBRARY JOHN CHUMACK / SCIENCE PHOTO LIBRARY
Comet Lulin (C2007 / N3) on February 20, 2009. Comet Lulin's Anti-Tail points to the east and it's blue ion tail points to the west. The anti-tail is the dust tail that appears to point in the opposite direction from the regular ion tail and is caused by an effect of the orbital geometry and our viewing angle here on Earth when the comet passes through the ecliptic. Photographed from Yellow Springs, Ohio, USA.
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