The South Pole–Aitken basin is an immense impact crater on the far side of the Moon. At roughly 2,500 km in diameter and between 6.2 and 8.2 km deep, it is one of the largest known impact craters in the Solar System. From Wikipedia
The analysis shows that the colossal impact deprived the farside mantle of water and metals, fueled two distinct volcanic eras and prompted a magnetic field resurgence billions of years later
