Snapshots of the Universe
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Spitzer Space Telescope and Galaxy Evolution Explorer
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ultraviolet view of Messier 31 galaxy Messier 31
A galaxy is like an extended family of a star. NASA's Galaxy Evolution Explorer studies these stellar families with ultraviolet light, which reveals young stars.

The blue regions in Messier 31 show where young, hot stars are forming along the galaxy's spiral arms. The central orange-white "bulge" of old, cooler stars formed long ago.

This image provides astronomers with a wonderful example of how galaxies develop.

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