Last updated on April 18, 2014 at 13:33 EDT
Comet Lulin
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Comet Lulin

February 24, 2009
The comet Lulin (center-right) is seen through the trees from Shenandoah National Park in Virginia, Monday, Feb. 23, 2009. Lulin, also known as the green comet, made its closest approach to the Earth overnight.