I think all are missing the point about hiding. Where else to hide a thing like this except in plain sight? We are then supposed to say "my, what an interesting rock that looks like a piece of wood!" NASA is thereby relieved of having to explain how a gang of railroad Coolies got a load of railroad ties to Mars with the secret help of Jules Verne and the Wright Brothers over a century ago. The truth would be embarrassing, especially since the Irish mission never made it with the rails (to the best of our knowledge).

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Time is a great teacher, but unfortunately, it kills all its pupils. Hector Berlioz

"To complete the picture all the photons can be seen to be synchronising friction on and off throughout the overall cone which itself is synchronised to the equal and opposite reaction of equilateral triangulation"... by a scientificator in ATM, too priceless to be lost to posterity.