Unlike on Earth, there is no erosion by wind or water on the moon because it has no atmosphere and all the water on the surface is frozen as ice. ... One little spacerock could easily wipe out a footprint on the moon.
An astronaut's footprint can last a million years on the surface of the moon. It may have been decades since we last set foot on the moon, but its surface is still marked with the historic footprints of the 12 astronauts who stomped across it. That's because the moon has no atmosphere.
Overall, both the astronauts' footprints and the artificial objects left by us on the Moon are destined to survive there for millions of years, up to 100 million years according to some estimates.
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