爱因斯坦环（Einstein ring）是指一种由于光源发出的光线受到引力透镜效应的影响，而使观测所得的光源形状改变呈环形的现象。
Treu博士和他的同事第一次确认最有可能观测到爱因斯坦环的区域是天空中两个或更多星系丛重叠出现的区域。
Dr Treu and his colleagues first identified the most promising places to look for Einstein rings-parts of the sky where two or more clusters of galaxies can be seen one behind the other.
天文学家们已经观测到了数个“爱因斯坦环”。他们来自遥远的星系，被近处的一个大质量物体(通常是另外一个星系)所弯曲，才来到地球。
Astronomers have seen "Einstein rings", formed when light from a distant galaxy is bent by the presence of a nearer massive object, usually another galaxy, that lies directly in its path to Earth.
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