A gravitational lens is formed when light is bent by a massive object.
引力透镜现象就是光被巨大质量物体弯曲的现象。
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Eventually, more advanced versions of the lens could be used to provide a wealth of information, such as virtual captions scrolling beneath every person or object you see.
If a large object passes in front of a more distant background star, it may act as a lens, bending and distorting the light of that star so that it may appear to brighten significantly.