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Because the objects came close to Earth — anywhere from 373 to 4,970 miles...
...If Bonilla's observations were correct, then the Earth could have seen "3,275 Tunguska events in two days," says one of the new study's authors — "probably an extinction event." Holy shit. Here's the arXiv.org article: http://arxiv.org/abs/1110.2798 Why is the PDF is a Comic Sans kind of font?