广义相对论预言这种光的波长会因这些星系的质量而有少量的偏移，这种效应称为引力红移。
General relativity predicts that the wavelength of this light will be shifted by a small amount due to the galaxies' mass, in an effect called gravitational redshift.
他们发现的红移量，似乎是由引力所引起，其数量恰好与广义相对论的预测相符合。
The amount of redshift they found that appeared to be caused by gravity agreed exactly with the predictions of general relativity.
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