Astronomy Picture of the Day
    

Keyword: Y2K
Тысячелетие исследования Земли The Millennium that Defined Earth
31.12.1999

When the second millennium began, people generally knew that the Earth was round, but few saw much of it beyond their local village. As the millennium progressed, humans mapped the continents, circumnavigated the globe, and determined the composition of the Earth.





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