Multimedia Features

Supernova Flashback
Cassiopeia A

The Cassiopeia A supernova's first flash of radiation makes six clumps of dust (circled) unusually hot. The supernova remnant is the large white ball in the center. This infrared picture was taken by NASA's Spitzer Space Telescope.

Image credit: NASA/JPL-Caltech/E. Dwek and R. Arendt

Larger view (labelled)
Larger view (unlabelled)