Old Sol is a solar system located on the Orion–Cygnus Arm, approximently 26,000 light years from the galaxic center. The central star of Old Sol is a G2 class star with a visual magnitude of −26.74 and a diameter of approximently 1.392×106 km. Old Sol was the orginal solar system where humans evolved, on the abandoned planet Old Earth. Old Sol also contains the abandoned planets Mercury amd Venus. Mars is the fourth planet in the Old Sol system.