Different moon rocks tell different tales about a long-ago bombardment

Rock samples from the moon's farside, returned by China's Chang'e-6 spacecraft in 2024, are challenging a long-held theory that the solar system experienced a sudden bombardment of impacts 3.9 billion years ago. The new samples show no clustering around that date, suggesting a longer, steadier period of impacts instead. Scientists say previous samples were likely skewed by debris from a single massive impact event.