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At roughly 1,600 miles in diameter and between 3.9 and 5.1 miles deep, the South Pole-Aitken Basin is the largest crater on the Moon, and one of the largest known impact craters in the Solar System.
The South Pole-Aitken Basin is believed to have been made about 4.3 billion years ago, while the Moon was relatively young - only a few hundred million years old.
Astronomers think the basin was created by a massive asteroid scraping along the lunar surface, carving out a crater.
Header image: The Moon With Saturn © Shamiqh Gajdhar - shortlisted in ZWO Astronomy Photographer of the Year 2025 Young competition