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 "You can't see the forest for the trees" might seem an appropriate analogy for astronomers attempting to determine the shape of the Milky Way galaxy when we are in fact located inside the galaxy. Discuss techniques used by astronomers to determine the type of galaxy in which we live, why  it is so difficult to determine the shape of our galaxy,  and where our Sun is located in our galaxy?

We need two different versions of posts. Please include work cited(direct quote needs quotation marks). Arround 200 words for each.

 
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