The Sophos system was home to at least one habitable world.
The Sophos system was colonized at some point after the late twenty-sixth century by the Alexandrian Covenant, a Deep Periphery proto-state created through the merger of colonists from the Magistracy of Canopus and the Taurian Concordat. At its height the Alexandrian Covenant was a nation of multiple worlds that enjoyed a degree of interplanetary trade; however, beginning in the 2700s, the Alexandrian Covenant was engulfed in a series of destructive civil wars known as Upheavals that eventually led to the loss of interstellar travel within the Covenant. The location of Sophos was identified by Interstellar Expeditions at some point after 3093, but at that point the Sophos system was uninhabited; IE found evidence of extensive Covenant civilization on Sophos, but no sign of the planetary population - and no overt signs of the planet having been engulfed in warfare, unlike the other Covenant worlds. The mystery of what happened to the population of Sophos remained unsolved as of 3095.
The Alexandrian Covenant is detailed within Interstellar Players 3: Interstellar Expeditions, but no map of the state is given - only the location of the Covenant in the Deep Periphery. It is therefore impossible to determine the precise location of Sophos.
- Interstellar Players 3: Interstellar Expeditions, p. 87, "Lost Worlds"
- Interstellar Players 3: Interstellar Expeditions, p. 76, "Deep Periphery (Rimward Sector)"
- Interstellar Players 3: Interstellar Expeditions, p. 84-85, "To The Lighthouse"
- Interstellar Players 3: Interstellar Expeditions, p. 85, "Day and Night"