Ray Cummings 
The Man on the Meteor 

Alone on this strange little world in the orbit of Saturn, the man who knew himself as Nemo, and the golden haired girl who called herself Nona, lived the lives of simple primitives. But weird was this planetoid where rocks burned and the water was fit to breathe, yet no less fantastic than the meteor itself was the bizarre Marinoid people who dwelt deep in its waters! A tale to remember.