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How far does a galaxy extend?

In Astronomy & Space
   

    


Recently, there have been many debates about how far out a galaxy actually extends to. The problem is that when we look at a galaxy, what we see is not all that we get! A (spiral) galaxy is composed of a bulge in the center and a flattened disk surrounding the bulge - these are the components of the galaxy that we can see through telescopes. But that's not all a galaxy is composed of: there are globs of dark matter (matter that we can't detect with ordinary observing techniques) that we call the "halo" of the galaxy.
366 days ago
  
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