Which specific crater, mentioned in the basin's name, is actually situated within the boundaries of the larger South Pole–Aitken basin?
Answer
Aitken Crater.
It is notable that the feature which lends part of its name to the entire structure, Aitken Crater, is actually a smaller impact feature situated entirely within the perimeter of the massive South Pole–Aitken basin. This sequential feature formation demonstrates that even after the grandest impact events, the lunar terrain continued to be modified by subsequent, though less catastrophic, collisions.

Related Questions
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