how do you know all of the stars are different

Question: how do you know all of the stars are different
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Asked by thequestionmaker to Werner, Vicky, Nick, Madgie, Carla on 14 Nov 2013.
- Werner Muller answered on 14 Nov 2013:
  
  I assume if you look close enough with a sensitive scope, you will find out that they look slightly different. Also they all appear to be at different locations.

Question: how do you know all of the stars are different