Thursday, 14 November, 2002, 19:00 GMTImpact 'showered debris over Britain' The Manicouagan crater is visible from space By Helen Briggs BBC News Online science reporter Evidence has emerged of how Britain's history was shaped by an asteroid collision 214 million years ago. Rock blasted out of the ground by an asteroid hitting the Earth has been found for the first time in the southwest of England. The skies would have gone dark; then it would have rained hot dust and rocks Simon Kelley, Open University Canada still bears the scars of the explosion, which splattered hot rock and dust across...