Gravitational lensing occurs because gravity, as Einstein showed, bends light.
引力透镜效应(注2)的产生是因为引力会改变光路，正如爱因斯坦提出的那样。
A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy out in space.
一百年前，爱因斯坦语言了一种宇宙重力透镜，这种透镜能够勾勒出宇宙中的的巨大星系。
A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy out in space.
一百年前，爱因斯坦语言了一种宇宙重力透镜，这种透镜能够勾勒出宇宙中的的巨大星系。
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