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Face of the moon to change completely – in 81,000 years' time

Bombardment by asteroids and comets is much heavier than previously thought, creating 180 sizeable new craters every year, say scientists The moon is bombarded by so much space rock that its surface gets a complete facelift every 81,000 years, according to a study of Nasa data. This churn – affecting the top 2cm (nearly an inch) of mostly loose moon dust – happens 100 times more frequently than previously thought, scientists have reported.
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