Well, the Fleet of Worlds isn’t a spaceship, either. Just a couple of celestial bodies moving along. Preceded by Barkon (Perry Rhodan 32, 1962) and Wanderer (Perry Rhodan 19, also 1962.)
Barkon was hollowed out and put on a course back the the galaxy, leaving its sun alone. Wanderer 8.000 km wide and looked like this:
