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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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