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Cosmic Explosions
MARCH 2007
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Cosmic Explosions Gallery Photo

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Gas Halo
Image by NASA/JPL/Caltech/Oliver Krause, University of Arizona

A halo of gas called Cassiopeia A is a remnant of a star that blew up 325 years ago. The blue dot near the center of this false-color composite is the leftover core of a massive star explosion, a neutron star so dense that a pinch of it would outweigh an Egyptian pyramid.

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