NGC 4522是距我们6000万光年的螺旋星云，属于室女 星系簇 （ Virgo Cluster ）,因为我心里只有你,天龙八部私服发布网。据了解，室女 星系簇 是离我们银河系最近的星系。
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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.
他在研究彗差星系簇的时候，发现星系本身的引力作用太小而不足以维持星系簇的成型。
While studying the Coma galaxy cluster, he found that the galaxies' gravity alone was much too small to hold the cluster together.
然后通过和那些只计算发光天体(星系)的质量进行对比，他们就能够得出星系簇中有多少暗物质的存在了。
By comparing that calculated mass to the mass that comes from only luminous objects (the galaxies), they can determine how much dark matter is in the cluster.
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