推 hsnucloud:awesome~ 07/25 00:28
→ NBL123:樓上的驕傲~~ 07/25 14:32
推 klks0304:酷耶:D 07/28 23:43
http://www.nasa.gov/multimedia/imagegallery/image_feature_1720.html
NASA's Swift satellite views Comet Lulin as it made it 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.
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