[TheMenacer]

There're all kinds of sites you could have in a deep space terrain. Maybe an asteroid field giving you astral/earth gems, or a ship graveyard for death gems. Deep space pirate or mercenary bases that allowed you to recruit units would fit pretty well too (as well as giving a resource boost to offset the whole "no resources in space" thing). Even things like nature or water gems via mysterious planetoids that support life somehow. Plus, how cool would it be to find a mage recruiting site along the lines of Warhammer 40k's Black Library, just an enormous secret floating library hiding in deep space waiting for someone to find it and discover its secrets.