天文学家通过一种叫做引力透镜效应的物理现象来测算星系中暗物质的质量。
Astronomers measure how much dark matter lies in galaxies by a fluke of physics called gravitational lensing.
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。
Gravitational lensing occurs because gravity, as Einstein showed, bends light.
他们通过各种技术绘制了大量“暗物质地图”，包括星系簇的引力透镜效应。
They've created numerous "dark matter maps" using different techniques, including gravitational lensing of galaxy clusters.
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