On the homeworld front, the geo survey status of all the planets was completed back when Earth was still habitable and is public knowledge, the moons however have only been surveyed through Jupiter, and no one knows what is on the asteroid belts or the comets, additionally Sol was much more heavily colonized int he past than it is now, so previously surveyed bodies who may not have any more minerals to find, could have ruins. Whether or not the possibility of ruins is something you want to risk conflict over is of course up to you.