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A cloud of gas is observed in which all of the spectral lines are shifted to the red...

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user380206 | eNotes Newbie

Posted May 30, 2013 at 1:39 AM via web

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A cloud of gas is observed in which all of the spectral lines are shifted to the red part of the spectrum. What does this tell us about the velocity of the cloud? This is called the Doppler effect. If one line is shifted from 656nm to 660nm, how fast is the cloud moving? 

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