Snapshots of the Universe
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Spitzer Space Telescope and Galaxy Evolution Explorer
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spiral galaxy Messier 101 Messier 101
This image of the spiral galaxy Messier 101 shows how these type of galaxies develop. The Galaxy Evolution Explorer's ultraviolet view finds young stars - only 10 million years old - concentrated in the spiral arms.

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