Asteroid Impacts: 10 Biggest Known Hits
The asteroid 2012 DA14 will miss Earth on Friday, but there's a long history of hits.
Earth's craters are enduring testaments to direct asteroid hits. And though millions—in some cases billions—of years of erosion have made it difficult to determine the exact size of the meteorites, there is a general scientific consensus around the world's largest craters, which mark the largest asteroid impacts.
Here are the ten biggest known:
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