(London Daily Mail) The extraterrestrial object that scientists say slammed into the Earth and sparked the extinction of the dinosaurs was most likely a speeding comet, new analysis claims.

New research has suggested that the 110 mile-wide Chicxulub crater in Yucatan, Mexico, was caused by the impact of a smaller object than previously thought.

But for a smaller object to have caused such a cataclysmic impact it must have been moving at speeds usually only reached by comets hurtling through our solar system from outer space.

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