The moon was exposed to a heavy bombardment of asteroids 3.9 billion years ago. The origin of this bombardment, however, was previously unclear. Planetologists at Münster University have now tested these hypotheses with very precise isotope measurements of lunar rocks. Their conclusion: The bombardment of the moon goes back to continuous impacts of asteroids left over from the main phase of the Earth’s formation. The results are published in the current issue of the journal Science Advances.
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Source: Phys.org