Top Ten Space Pictures: Best of 2009 (9)
16:35, December 24, 2009 
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Green Comet Makes Its Debut
Comet Lulin is framed by red-lit trees in Virginia's Shenandoah National Park in a picture taken February 23. The green, "two tailed" comet made its closest approach to Earth in February, swinging past at about 38 million miles (61 million kilometers). And considering the comet's nearly parabolic orbit, experts said, that first visit may have been its last.
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Comet Lulin is framed by red-lit trees in Virginia's Shenandoah National Park in a picture taken February 23. The green, "two tailed" comet made its closest approach to Earth in February, swinging past at about 38 million miles (61 million kilometers). And considering the comet's nearly parabolic orbit, experts said, that first visit may have been its last.
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