Most of us associate "asteroid strike" with The Big One—that cataclysmic collision of space               rock and earth.

  led to the extinction of the dinosaurs tens of millions of years ago. But a British scientist has made a discovery that might put a twist in that long.

Nicholson published his observations in the latest issue of the journal Science Advances. He believes the five-mile-wide crater was          likely caused by an asteroid.

He and his colleagues estimated that the projectile that plunged into the waters off Africa's west coast was a       stony asteroid 1,300 feet long.

moving at 12 miles per second," the New York Times said. "Its impact unleashed an explosion equivalent    to 5,000 megatons of TNT.

enough to bend a car around a lamppost and send a wall of water several skyscrapers high racing toward shore.

"Across the Atlantic Ocean at least, the (Nadir) effect would have had significant local and regional repercussions," Nicholson told CNN.

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