Garvin and his team used a new catalog of high-resolution satellite images to take a closer look at some of the largest impact craters that have formed in the past million years.
The actual size of these craters turned out to be larger than previously thought. For example, the Zhamanshin impact crater in Kazakhstan, which is about 12 to 14 kilometers wide, is believed to have been formed by a meteorite impact between 200 and 400 meters in diameter about 90,000 years ago. But the crater is actually close to 30 kilometers across, according to the new analysis. Now scientists assume that kilometer-sized objects fall from above every few tens of thousands of years.
Source: Ferra
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