Sunday, October 26

前几天有人问杨立伟飞行员从太空能看到长城吗？。。。取决于我们如何定义看见。：）

让我们通过下面这个网站来看看从太空到底能看到什么。
Molecular Expressions: Science, Optics and You - Powers Of 10: Interactive Java Tutorial
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