A provocative new study suggests Earth’s large impact craters are bigger than previously thought—meaning our planet is more at risk of getting hit hard by an asteroid.
Using a new catalog of high-resolution satellite imagery, Garvin and his colleagues identified large rings around three impact craters and one probable one that are 1 million years old or younger. To Garvin, the rings imply the craters are tens of kilometers wider, and record far more violent events, than researchers had thought.
It’s an extraordinary claim, as Garvin himself admits. “We haven’t proven anything,” he says. Without fieldwork to back up the conclusions, impact researchers are wary of the circles Garvin and his colleagues have drawn on maps—especially because they defy other estimates of impact rates. “I’m skeptical,” says Bill Bottke, a planetary dynamicist at the Southwest Research Institute in Boulder, Colorado. “I want to see a lot more before I believe it.
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