I think Fifty Shades of Grey has had more commercial success than The Martian. It was originally published as an episodic piece of Twilight fan fiction (Master

I think Fifty Shades of Grey has had more commercial success than The Martian. It was originally published as an episodic piece of Twilight fan fiction (Master of the Universe) https://en.m.wikipedia.org/wiki/Fifty_Shades_of_Grey https://en.m.wikipedia.org/wiki/Fifty_Shades_of_Grey