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Measuring Light Years

  1. Mar 23, 2015 #1
    I was reading up on the Andromeda Galaxy and it was saying that it was 2.2 to 3 million light years away from earth. So my question is how do we measure how far it is in light years?
  2. jcsd
  3. Mar 23, 2015 #2


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  4. Mar 23, 2015 #3
    Awesome thank you!
  5. Mar 24, 2015 #4


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