The team are two representatives from an unamed non technological interstellar civilisation. They look like large globes about two meters in diameters, with eyes moving on their surface. They are peaceful, very intelligent and able to move in air and through space. The extent of their capacities remains unknown. The only known recorded contact of this species with mankind is when the team visits Earth in 3952.
Source: Clifford Donald Simak, A Heritage of Stars (1977)