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.
在小行星牵引任务中，引力拖车方法的优点是不依赖小行星特性、可靠性高，缺点是偏移能力有限。
The merits of gravitational tractor in asteroid deflections are its high reliability and independence of asteroid characteristics, and the demerit is its low deflection efficiency.
最后，比较了普通引力拖车和太阳帆引力拖车的偏移能力。
Lastly, the deflection capabilities of traditional gravitational tractor and solar sail gravitational tractor are compared.
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