A little late, I know (see credits for lore! :>)
From The Æther, we come! The Titan mothership has arrived at the desolate world of Gaia and Research Director Mimas, the head of this new colony being the ambitious man he is sees an opportunity for Ætherium's first big project here. After setting foot on the barren world he announces that Ætherium will attempt to terraform Gaia and restore it too its former glory! Meanwhile the mothership activates the large automated factories on board to start producing starships for the new colony (since aside form starfighters and drones, the mothership is currently Ætherium's only spacecraft). We begin harvesting recourses wherever we can and the factories immediately get too work on building a substantial fleet for further exploration and now, due to the recent conflict also a substantial star navy to defend Ætherium in case anyone attacks. Paranoia over an attack has led Ætherium to heavily fortify Gaia with satellites and later a barricade fleet to make sure no unwanted guests decide too invade. Once enough starships have been manufactured and the perimeter defense wall surrounding Gaia is complete we send probes to study the other nations in order to find out who is friendly and who isn't.