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Mars comet encounter to provide new clues to our solar system's earliest days

 In this handout photo the comet Lulin (center-right) is seen through the trees in Shenandoah National Park on February 23, 2009 in Luray, Virginia
In this handout photo the comet Lulin (center-right) is seen through the trees in Shenandoah National Park on February 23, 2009 in Luray, Virginia
Photo by Bill Ingalls/NASA/Getty Images
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