I need to refind the source, but [I believe] the Traveler comes from the "world within a bottle" that is described in Ghost Fragment: Ghost. Alpha Lupi is the closest association we have to the Traveler- some think it is the Traveler, while others say its the location. Alpha Lupi is a star in the Lupu grouping, able to be seen with the naked eye. Its several lightyears away. The Traveler as we know it (the big orb) is mostly made out of neutronium, a theoretical material made out of nothing except neutrons. The actual Traveler's form is currently unknown. The Traveler tried to run, but Rasputin shot it down. The reasoning is highly disputed, but we do know that a Warmind Failsafe was put into place that stated that if the Traveler, who the Warminds saw as essential for humanity's survival, tried to run, then they would need to "coerce it" into staying. They shot "full caedometric and noetic" resources to keep the psuedoaltruistic Traveler grounded. The Dreams of Alpha Lupi describe these resources as Knives. The Traveler rest now because it is weak, it know ponders on its uselessness and hopes it does not appear so meek around it.