「经济学人」Connecting the dots

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)

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