A US rocket is to crash into the moon Friday in an experiment scientists hope will provide data about ice hidden in the perpetually dark lunar craters.

Astronomers around the world are prepared to capture the impact of the Lunar Crater Observation and Sensing Satellite (LCROSS) into the moon's Caebus crater at 1130 GMT. The rocket will deliberately crash into the moon, kicking up a plume of dust that scientists hope to analyse for traces of water that they believe are abundant in the cold, shadowy craters.