Scans of underwater crater in West Africa suggest another large asteroid smashed into the planet around the same time
The massive asteroid that brought about the end of the reign of the dinosaurs when it crashed into Earth 66m years ago was not a one-off, researchers say.
Detailed scans of an underwater crater off the coast of Guinea in West Africa suggest that it was created when another large asteroid smashed into the planet around the same time at the end of the Cretaceous period.
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