Neptune
From superman.nu: Supermanica
The eighth planet from the sun.
In July 1958 Superman journeys to Neptune to obtain a stone Superman head once sculpted by the Neptunians in his honor. The sculpture is one of a series of so-called “space trophies†which the Man of Steel gathers for inclusion in a time capsule which the Metropolis Museum plans to bury in the ground as a gift for the people of the fiftieth century A.D. (S No. 122/1: “The Secret of the Space Souvenirsâ€).