The Terrans of the Solar System have a long history of spaceflight and exploring the Jump Gate network. After the events of the Terraformers over Earth, the Terrans severed their contact with the rest of the galaxy and had several centuries of rebuilding and advancement in isolation. Their brief return led to the Terran Conflict which preceded the mass disconnection of Jump Gates. It is unknown if the war precipitated this event.
A list of all sectors Segaris Pioneers start with when a new game is created.