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William and Caroline Herschel's map included four of the following hypotheses in their model of the galaxy. Which one was the exception?a.​They placed the Sun in the center of the galaxy.b.​They thought that the "holes in the sky" were caused by interstellar dust clouds.c.​They provided accurate measurements of the distances to stars.d.​They found errors caused by a lack of knowledge of the interstellar medium.e.​They proposed that the galaxy had a disk shape.

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