You are unusually simple today. Or are you simply trying to keep people from thinking?
Ancients didn't build arches on the moon. Ancients didn't build arches from scratch without any planet... like in space, as might have happened. Has anyone taken into account the balance of gravitational pull from opposite sides, to show much lighter weights for mass ratios, and how such would affect various materials in arches?
Remember, graphene wasn't supposed to exist with all of its properties. But someone made it, and graphene is just the start in
that direction. Other materials can for graphene-like structures, and there are other structures similar to graphene that carbon can be formed into. Even so, planet and moon structures might be different that the standard ideas, because oh non-standard ideas that weren't used in the calculations.
Planets and moons MIGHT be solid. We don't know enough of physics to know for certain that they are solid. And many objects in space are not round.
Your link does tests in certain ways. Great! But what about other ways. Like my diagrams, above, for example?