「经济学人」Connecting the dots

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Geology Earth may once have had a planetary ring It would have collapsed 450m years ago Could Earth once have had a planetary ring like the ones around Saturn? Scientists from Monash University in Australia think so. In a recent paper they identify 450m-year-old craters that lie close to Earth's historical equator. They propose these were caused by the collapse of a ring of debris (possibly the remnants of a large asteroid) that once circled the planet. The ring might have lasted tens of millions of years, cooling Earth with its shadow. (Sep 18th 2024) 我没有译文，仅供拓展阅读 LearnAndRecord 2015年2月8日 2024年9月23日 第3516天 每天持续行动学外语 ………………………………