Dazzling Universe
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intearcting galaxies Galactic Pair
An interacting pair of galaxies, together called Arp 82, is a scientific oddball. The color in the "tilted S" pair indicate that the observed stars are young to intermediate in age, around 2 million to 2 billion years old, much less than the age of the universe (13.7 billion years).

Scientists wonder why Arp 82 didn't form many stars earlier, like most galaxies of its mass.

The Spitzer Space Telescope, the Galaxy Evolution Explorer and the Southeastern Assoc. for Research in Astronomy Observatory contributed to this image.

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