Ganymedean (A Honeymoon in Space)

The Ganymedeans are a race of highly advanced humanoids native to Jupiter's moon Ganymede. They're considerably taller than humans, but otherwise practically indistinguishable in physical appearance. While they do have the technology to create spaceships, they haven't actually explored other worlds.

Appearances

 * A Honeymoon in Space, by George Griffith (1901)