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Cassiopeia A is the youngest supernova remnant in the Milky Way, and is the brightest radio source in the sky at frequencies above 1 GHz. In this 2006 photo, taken by the Chandra X-Ray Observatory spacecraft, the blue, wispy arcs show the areas where acceleration is occurring as the super-heated material expands outwards.

The supernova is about 10 lightyears across and is expanding at a rate of 4,000-6,000 km/s.

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Cassiopeia A

Photo credit: NASA/CXC/MIT/UMass Amherst/M.D. Stage et al.