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Nasa's experiment last month to find water on the Moon was a major success, US scientists have announced.

The space agency smashed a rocket and a probe into a large crater at the lunar south pole, hoping to kick up ice.

Scientists who have studied the data now say instruments trained on the impact plume saw copious quantities of water-ice and water vapour.

One researcher described this as the equivalent of "a dozen two-gallon buckets" of water.

"We didn't just find a little bit; we found a significant amount," said Anthony Colaprete, chief scientist for the Lunar Crater Observation and Sensing Satellite (LCROSS) mission.