Scientists have dated the moon's oldest and largest impact site, the South Pole-Aitken basin, to a period between 4.32 and 4.33 billion years ago. The discovery was made by analyzing a lunar meteorite found in Algeria in 2005. This finding challenges the previous understanding of the moon's history, indicating that the intense period of impact bombardment may have been more gradual over a longer period. The implications of this research extend to Earth's early history, providing clues about the conditions on our planet during the same period.

Source: https://www.livescience.com/space/the-moon/scientists-have-dated-the-moons-oldest-and-largest-impact-site