The Andromeda spiral galaxy is shown in this infrared image taken by NASA's Spitzer Space Telescope and released by on October 18, 2006. Astronomers have new evidence that the Andromeda spiral galaxy was involved in a violent head-on collision with the neighboring dwarf galaxy Messier 32 (M32) more than 200 million years ago. (NASA/JPL-Caltech/D. Block - Anglo American Cosmic Dust Lab, SA/Handout/Reuters)
This Hubble image of the Antennae galaxies is the sharpest yet of this merging pair of galaxies. As the two galaxies smash together, billions of stars are born, mostly in groups and clusters of stars. The brightest and most compact of these are called super star clusters. (NASA, ESA/Hubble, and B. Whitmore - Space Telescope Science Institute/Handout/Reuters)
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