Irradiated dust streams through space near the Cassiopeia A supernova remnant in this dynamic James Webb Space Telescope image. (Image credit: NASA, ESA, CSA, STScI, J. Jencson (Caltech/IPAC)) ...

NASA’s James Webb Space Telescope’s new view of Cassiopeia A (Cas A) in near-infrared light is giving astronomers hints at the dynamical processes occurring within the supernova remnant.

In the year 1181 (the supernova's namesake), humankind was observing the constellation Cassiopeia when a bright light joined ...

The collective supernova aftermath is famously called Cassiopeia A. Less famous, however, is the brief yet intense pulse of X-rays and ultraviolet light the dying star had pumped into space.