Description
今天我们对宇宙的认识都是建立在观测数据的基础上的，很久以前，人们一直认为宇宙里的星系都是漂浮在虚空之中的，而且大致是静止的。星系退行的谜团直到埃德温·哈勃把他的研究方向转移到这个问题上后才有了起色。他当时并不看好各种理论，因为强大的威尔逊山天文台的100英寸望远镜使新数据的可信性得到了保证。他的口头禅很简单：“除非实证结果已经穷尽，否则我们不需要借助于思辨的梦幻般玄想。”
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