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
Chang’e 6 samples from the Moon’s far side reveal an unexpected strengthening of the lunar dynamo 2.8 billion years ago.
