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ginvodka | 12:05 Mon 20th Oct 2014 | Crosswords
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17a A move toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth (3,5) ?E?,S?I?T

(That's a fair mouthful of a clue :) )

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red shift
12:06 Mon 20th Oct 2014
red shift

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