Snapshots of the Universe
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Spitzer Space Telescope and Galaxy Evolution Explorer
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supernova remnant Cassiopeia A Death Becomes Her
Knowing how stars die is just as important as knowing how they form and develop. This image shows the remnant of a once massive star that died in a violent supernova explosion more than 300 years ago. This false-color view of Cassiopeia A shows the dead star and a surrounding shell of material that was blasted off as the star died.

Images from Spitzer, the Hubble Space Telescope and the Chandra X-ray Observatory were combined to create this view.

+ Full image and caption
  Jet Propulsion Laboratory
   California Institute of Technology