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Space Photos of the Day 07/28

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NASA's Swift satellite views Comet Lulin as it made its closest approach to Earth in February 2009. Lulin, like all comets, is a clump of frozen gases mixed with dust. These 'dirty snowballs' cast off gas and dust whenever they venture near the sun. Comet Lulin, which is formally known as C/2007 N3, was discovered in 2008 by astronomers at Taiwan's Lulin Observatory. Lulin passed closest to Earth -- 38 million miles, or about 160 times farther than the moon -- late on the evening of Feb. 23, 2009, for North America.

PHOTO: NASA, Swift, Univ. Leicester, DSS (STScI/AURUA), Dennis Bodewits

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