Our planet hides its scars well.
that hit Earth around 90,000 years ago – the most recent impact to have potentially caused a 'nuclear winter' style event.
The rim diameters of three other large craters have also been recalculated, all doubling or tripling in size. The implications are profound, suggesting kilometer-sized objects are coming down from above every few ten-thousand years.
France Dernières Nouvelles, France Actualités
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