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This supernova, discovered in 1604 by Johannes Kepler, belongs to an important class of objects that are used to measure the rate of expansion of the universe, known as Type 1a supernovae. The view you see here, released March 18, 2013 was produced using data from NASA's Chandra X-ray Observatory as well as infrared and optical imagery. The Chandra X-ray observations led astronomers to conclude that the supernova was triggered by interaction between a white dwarf and a red giant star. (Photo by CXC/NASA/JPL-Caltech)
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