…Both the Eratosthenes and Copernicus craters have streaks of light, but the brightness of the streaks indicates that the Copernican crater is newer. This is where the classification of the Eratosthenes and Copernicans came into being. Rocks from each geological period were collected by Apollo and dated using radioisotopes. … *Some of the terminology that refers to the "Eratosthenes era" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…エラトステネスもコペルニクスも光条を伴ったクレーターであるが,光条の明るさからコペルニクス・クレーターのほうが新しいことがわかる。ここで,〈エラトステネス代〉と〈コペルニクス代〉の分類がでてくる。おのおのの地質時代の場所で,アポロによって月の岩石が採集され,放射性同位元素によって年代が測定された。… ※「エラトステネス代」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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