Explorer 1 概述 - 美国第一颗人造卫星
Explorer 1是美国第一颗成功进入轨道的人造卫星，于1958年1月31日发射升空。这颗卫星发现了地球周围的范艾伦辐射带，标志着美国太空探索的开端，并为后续的太空任务奠定了基础。
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A world map by Jeff Blossom displays roughly 200,000 years of human migration patterns. The visualization illustrates the historical movement of human populations across the globe.
The author woke up at 4:30 am with an essay forming in their mind. Since their laptop was nearby in the hotel, they got up to write down the sentences they already had. Two hours later, they had written the entire essay.