The Traveler is a mysterious, city-sized sphere in the Destiny Universe that hangs low over the Earth.
Its origins and nature are unknown. When it arrived, humanity first discovered it on Mars. It sparked a Golden Age of humanity that allowed humans to become interplanetary. Some speculate that the Traveler is a large vessel; others believe that it is a sentient being or artificial intelligence and some may even consider it a deity.
The Darkness is an ancient enemy of The Traveler and caused a cataclysmic collapse that ended humanity's Golden Age. The Traveler sacrificed itself to save humanity from it, and following its last battle against it, became silent and dormant in the place it now rests, hovering low above Earth.