This reminds me of a passage from Arthur C. Clark's <i>Imperial Earth</i>, set in 2276, in which a retrospective video on the first flight to the moon segues to a shot showing Tranquility Base at the (then) present time, complete with fallen flag and space tourists waving to cameras in the background.<p>There's an ongoing preservationist debate over whether or not to re-plant the flag or leave it where it is.<p>Other than UV bleaching and depolymerization of plastics (including the nylon the flag is made from), and slow micrometeorite ablation, these relics should stand for billions of years.