How long will the Apollo footprints likely be on the moon? Hint: it's longer than a lifetime.

The Apollo astronauts' footprints will be preserved on the moon much longer than any made on Earth, due to the lack of atmosphere in space. With no wind or water to come into contact with the ground there, they'll likely only vanish via micrometeorites causing erosion. Experts estimate that will take 100 million years.

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