The Moon has no atmosphere, so surface tracks there can remain for millions of years.

The longer version

Without wind or rain, nothing on the Moon erases a footprint. There is no atmosphere to weather rock, no flowing water to carry sediment, and no active plate tectonics to recycle the crust, so disturbances persist for extremely long periods. Daylight and darkness alternate slowly, with no weather in between.

The main agents of change are impacts, which churn the surface slowly, and the steady rain of charged particles and fine dust. Slopes eventually creep as material settles. On the airless surface, sharp crater rims and dark tracks stay crisp in a way they never could on Earth. Dust also becomes electrically charged and clings to surfaces.

Where this entry sits

The night sky looks calm, yet almost everything up there is moving, burning, or slowly changing. These facts cover planets, stars, the Moon, gravity, black holes, comets, and the story of how people began exploring beyond Earth. The full list sits on the Space and Sky page, where every entry is listed in order.