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Geneviève de Messières

The explosive death of a star created this debris cloud, Cassiopeia A, still expanding at shock-wave speeds. This photograph combines an optical image taken by Ken Crawford of the Rancho Del Sol Observatory and X-ray images from NASA's orbiting X-ray telescope NuSTAR, the first telescope to create focused images of high-energy X-rays. Via apod.nasa.gov.

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