Cassiopeia A

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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James Webb telescope performs "stellar autopsy" on Cassiopeia A, a well-known supernova remnant whose debris field reveals the composition of the doomed star that gave birth to it.

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

Webb Shows Supernova Remnant Cassiopeia A in New Light

Astronomers Blown Away By New NASA Webb Images Of ‘Cassiopeia A’ Supernova Remnant

Webb reveals never-before-seen details in Cassiopeia A

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

IXPE Maps Polarized X-Rays from Cassiopeia A

Supernova Remnant Cassiopeia A is Lopsided

Ejection nebula of supernova Cassiopeia A does not expand evenly

IXPE X-ray observatory completes commissioning, eyes Cassiopeia A for calibration