Have to admit that my first thought was that the site was probably the alien equivalent of one of our (human) planet-side settlements. There are buried landing pads, control and storage structures. The layout might have no special significance outside of alien aesthetics.
The big questions are: who built this stuff, and more importantly, why did they seemingly abandon it all?
And why build anything on that useless lump of rock?
- It has very low gravity, which is good if you want to shoot stuff into space.
- It has a very close companion, which is good if you run some sort of tidal powered machine.
That's all I have. Not much.