Remnant Cassiopeia

Cassiopeia A (Cas A) (listen) is a supernova remnant (SNR) in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies above 1 GHz.

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It’s Time for Supernova Remnant Cassiopeia A to Get the JWST Treatment

Webb Shows Supernova Remnant Cassiopeia A in New Light

James Webb Reveals Never-Before-Seen Details in Supernova Remnant Cassiopeia A