How do we know the shape of the Milky Way?

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How do we know the shape of the Milky Way?
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Clip from Stargazing  |  Season 4  |  Episode 3  |  BBC Knowledge  |  January 22, 2017

If we have never been outside the Milky Way, how do we know it's a spiral at all?

If we have never been outside the Milky Way, how do we know it's a spiral at all?

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