Shackleton Crater is a large impact crater on the far side of the Moon. It is located at the south pole of the Moon, and is one of the largest craters in the solar system, with a diameter of approximately 1,000 kilometers. The crater was named after the British explorer Ernest Shackleton, who was the first person to reach the South Pole.
The crater is thought to have been formed by an impact event that occurred around 3.8 billion years ago. The impactor is thought to have been a large asteroid or comet that struck the Moon at high velocity. The resulting impact crater would have been several times larger than it is today, but has since been partially filled in by subsequent impacts and volcanic activity.
The interior of Shackleton Crater is believed to be largely composed of lunar mantle material that was excavated during the impact event. This material has been studied extensively by lunar scientists and has helped to unlock many secrets about the early history of our solar system.