Here are some images of clusters of galaxies. 这是一些星团的照片。 They're exactly what they sound like. 正如听上去一样。 They are these huge collections of galaxies, 它们是一堆星系， bound together by their mutual gravity
See, for every qualitative thing about us -- you know, those parts of us that are emotional, dynamic and subjective 关于我们的每一个定性的特征，比如属于我们情感的、动态的、主观的部分， we have to convert it to a quantitative metric: s
