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The 13 biggest asteroids to ever hit planet Earth

While Earth was famously hit by a meteor that killed off the dinosaurs, many others have also hit our planet, many of them ...
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Two NASA spacecraft detect biggest meteor strikes at Mars

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. CAPE CANAVERAL, Fla. (AP) — Two NASA ...