Finally, somebody picked up on this one.
The Expanse RPG - Green Ronin Games
For myself, this is Ucking Fuge, because Green Ronin already proved their chops with their A Song of Ice and Fire RPG (that's Game of Thrones to the rest of the world) and did a first class job in the process. I've seen the Quickstart Edition, available as a PDF for free, and things look very promising. As a bonus, the series authors have been involved in the development and writing, so any information presented in the game should be considered canon.