Otherwise invisible to telescopic views, the dark matter was mapped by observations of gravitational lensing of background galaxies. 另外对于望远镜视野里不可见的暗物质，是通过对背景星系引力透镜观测后绘画上去的。
Dr Clowe and his colleagues used a technique called gravitational lensing to detect the mass distribution of the bullet cluster. 克洛博士和他的同事使用一种叫做引力透镜的技术来探测子弹状星云团内物质的分布情况。
