A Year in the Life of an Infrared Echo

These images from NASA Spitzer Space Telescope, taken one year apart, show the supernova remnant Cassiopeia A yellow ball and surrounding clouds of dust reddish orange.

These images from NASA Spitzer Space Telescope, taken one year apart, show the supernova remnant Cassiopeia A yellow ball and surrounding clouds of dust reddish orange.

Cassiopeia ASpitzer Space Telescope