A mysterious crater found in the Atlantic Ocean off the coast of west Africa may have been left by the baby cousin of the asteroid that killed the dinosaurs 66 million years ago, scientists say.Dubbed the Nadir Crater, the new feature was discovered 248 miles (400km) off the coast of Guinea in west Africa.It sits around 1,000ft (300m) below the seabed and has a diameter of 5.2 miles (8.5km).
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