Beowulf notes, however, that the speed at which the Fleet of Worlds is moving (0.8c) would cause nearly as much damage as the Core explosion itself. This suggests radiation may not be the primary danger the Puppeteers flee, also that Puppeteers may, in fact, have a means to deal with radiation affecting entire worlds. In "Crashlander" it is speculated that the Puppeteers are planning on moving to the now-uninhabited Core, isolated from potentially dangerous species - which would have either fled the galaxy entirely or been destroyed. Their initial path is revealed to be out of the plane of the galaxy, but no mention is made of Louis Wu noticing trajectory when flying there on the "Long Shot" in "Ringworld".