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This supernova dominated our skies for weeks, a thousand years ago. It was brighter than Venus and visible during the day, and observers documented it in China, Japan, Europe and the Arab world. We now know that the brightest supernova on record, SN 1006c, was caused by a white dwarf star that gained mass from a companion star until it gorged itself and exploded. Click through for some more mind-blowing images of SN1006c, including some super-colorful X-ray images. More »
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You can still see the shock wave from the explosion of supernova Cassiopeia A in this color-enhanced image from NASA's Spitzer Space Telescope. The blue glow around the dead star is the "forward shock," material blasted with energy by the shock wave when the star blew. Click through for a gallery of the biggest space detonations ever, including a deep-space eruption that released thousands of suns' worth of energy in a few seconds. More »
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