The Pathfinder Vessel spirals towards Moya
The Pathfinder vessel after colliding with Moya
A Pathfinder vessel was an alien vessel piloted by Pathfinder scientists studying wormholes.
The vessel was smaller than Moya and was comprised of segments. When it exited the wormhole that it was studying, the ship spiraled toward Moya before colliding with her. It held a vast wealth of wormhole information, and was almost like the entire spaceship was the computer itself.
The lead scientist on the vessel was Neeyala, a Pathfinder, and the ship was sparsely crewed with no apparent military presence. ("Self-Inflicted Wounds - Could'a, Would'a, Should'a", "Self-Inflicted Wounds - Wait for the Wheel")