In early 1932, Dutch astronomer Willem de Sitter gave a popular lecture in San Francisco, which was published in the April 1932 Publications of the ASP under the title “The Size of the Universe.” In this lecture de Sitter described several theories for the nature of the universe, whether it might be expanding or static, and whether it is infinite or finite. Eighty years later we are still working on some of those questions.
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机译：1932年初，荷兰天文学家威廉·德·西特（Willem de Sitter）在旧金山做了一个受欢迎的演讲，该演讲发表在1932年4月的ASP出版物中，标题为“宇宙的大小”。在本次讲座中，de Sitter描述了有关宇宙本质的几种理论，即宇宙是扩张的还是静态的，以及它是无限的还是有限的。 80年后，我们仍在解决其中一些问题。
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