Surveyor landers photographed a faint glow along the horizon after sunset, and the leading explanation is that sunlight charges the dust until the grains push each other off the ground.

With no air to hold them, charged grains a few micrometres across can hop, and near the terminator the charge difference between lit and unlit ground is at its sharpest. Apollo 17's crew sketched something similar from orbit. Later missions have struggled to reproduce the measurement, so the glow is real and its cause is not fully nailed down.