Asteroid impacts shifted the moon’s poles over billions of years

The moon’s poles have shifted as a result of asteroid impacts over billions of years, new research shows. 

Astronomers have long used lunar craters to chart the history of both the moon and the whole solar system, because the distribution of the destruction left by asteroid impacts paints a picture of the violent conditions found in the young solar system. The new research turns the tables on those studies by simulating the removal of thousands of craters and by also considering the impacts of smaller craters, thus rewinding 4.25 billion years of lunar history.

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