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What was the principle reason that the measurements of Herschel and Kapteyn didn’t reveal the correct shape and size of the galaxy?

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  1. Methods of measuring distance to stars that were developed then, were falling short in accuracy. This makes it a hazard to guess galactic distances in the Milkyway.  


  2. No, no no.  Herschel never attempted the project.

    Kapteyn underestimated the effects of interstellar dust.

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