Tidal Moon

"Tidal Moon" is a science fiction short story by American writer Stanley G. Weinbaum and Helen Weinbaum that first appeared in the December 1938 issue of Thrilling Wonder Stories and was reprinted in the collection Interplanetary Odysseys (2006). Sam Moskowitz stated that Stanley G. Weinbaum completed only a page and a half of the story before his death and that his sister Helen Weinbaum completed the story on her own. "Tidal Moon" is the only story by Weinbaum to take place on Ganymede.