You can still see the shock wave from the explosion of supernova Cassiopeia A in this color-enhanced image from NASA's Spitzer Space Telescope. The blue glow around the dead star is the "forward shock," material blasted with energy by the shock wave when the star blew. Click through for a gallery of the biggest space detonations ever, including a deep-space eruption that released thousands of suns' worth of energy in a few seconds.

All images by AP.