7. New supernova "gumball" picture
The remnant of a supernova called SN 1006 hangs like a gumball 7,000 light-years away in a composite image released by NASA on June 26, 2008. The blast wave from the stellar explosion is still traveling at about 6 million miles (9.6 million kilometers) an hour, heating gases along its path that emit radiation in visible light.
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