A huge asteroid wiped out the dinosaurs, but what danger do smaller ones pose?

Monica Grady, The Open University January 22, 2018 – A small asteroid passed relatively close to Earth this month, having been discovered just six days earlier. This might sound scary, but it’s unusual that such an object would actually collide with the Earth. Each year about 50,000 tonnes of extraterrestrial material (rocks and dust) hits […]

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