How Does The Rotation Of A Galaxy Result In Spectral Line Broadening?

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How Does The Rotation Of A Galaxy Result In Spectral Line Broadening?

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-The shifted lines from the two moving sides of the galaxy combine with the unshifted line from the center, resulting in a broader frequency distribution. -Light from opposite sides of the galaxy is shifted in different directions, causing the spectral lines to move to higher or lower frequencies relative to the unshifted line.

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