What geological or environmental feature near the lunar South Pole makes landing there more technically challenging than Apollo's equatorial sites?

Answer

Uneven mass distribution causing "lumpy" gravity fields that perturb orbits.

Landing near the South Pole is complex partly because the Moon's uneven mass distribution creates "lumpy" gravity fields, which perturb orbital paths and require constant, precise navigation correction.

What geological or environmental feature near the lunar South Pole makes landing there more technically challenging than Apollo's equatorial sites?

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