Hour-long hailstorm may have caused 1,000-year freeze, say scientists An hour-long hailstorm from space may have changed the climate of the Earth in 11,000 BC, leading to a freeze lasting more than 1,000 years, scientists say. Published: 8:00AM BST 02 Apr 2010 An hour-long hailstorm from space may have changed the climate of the Earth in 11,000 BC, leading to a freeze lasting more than 1,000 years, scientists say. A comet may well have caused the earth to freeze for over 1,000 years Photo: GETTY The catastrophe, caused by a disintegrating comet, wiped out large numbers of animal species and...