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The asteroid that led to the extinction of the vast majority of dinosaurs may have been followed by asecond smaller impact roughly 5,000 miles away. The scenario has been proposed following the discovery of an impact crater off the coast of West Africa dating to the same time period.

Current theories suggest a 6-mile-wide asteroidstruck Earth just off Mexico’s Yucatán Peninsula roughly 66 million years ago. The impact sent a tidal wave crashing as far north as present-day North Dakota, altered the climate, and led to the mass extinction of about three-quarters of the species alive at the time. The new discovery, dubbed the Nadir crater, was accidentally found by geologists studying tectonic plates. It is unclear whether the object broke apart from the primary asteroid as it entered the atmosphere, or was a wholly separate body. 

Separately, read about a fossil that scientists believe may have been preserved on the day of the first asteroid impact.