"Redemption Cairn" is a science fiction short story by American writer Stanley G. Weinbaum that first appeared in the March 1936 issue of Astounding Stories. "Redemption Cairn" is the only Weinbaum story set on Europa. In Weinbaum's Solar System, in keeping with the then-current "near-collision" hypothesis of planetary formation, Jupiter radiates enough heat to create Earth-like environments on the Galilean moons. Europa is airless except for a depression on the Jupiter-facing side of the tidally locked moon, which holds a thin, but breathable atmosphere. This region is divided into a number of small valleys separated from each other by ridges rising above the atmosphere.