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National Geographic's top 10 space pictures of 2008 (4)
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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. (Photo: NASA)
A supermassive black hole at the center of the Milky Way has wound up in the crosshairs of a virtual telescope spanning 2,800 miles (4,506 kilometers). Although by definition we can't see a black hole directly, we can see the bright region of radio emissions known as Sagittarius A* that's thought to be either a disk of matter swirling toward the black hole, or a high-speed jet of matter being ejected from it. (Photo: NASA)
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