A NASA image of the debris of an exploded star, known as supernova taken from NASA's Chandra X-Ray Observatory. Astronomers who have long used supernovas as cosmic mile markers to help measure the expansion of the universe now have an answer to the nagging question of what sparks the massive stellar explosions.
(AFP/NASA/File)http://news.yahoo.com/nphotos/slideshow/photo//100218/photos_sc_afp/869bed157433e1189306588d016119be/
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