The Expanse series is a science fiction series written by James S.A. Corey (a pen name for authors Daniel Abraham and Ty Franck). It is set in a future where humanity has colonized the solar system and follows the crew of the spaceship Rocinante as they navigate political tensions and mysterious events that threaten the stability of the system. The series combines elements of space opera, political intrigue, and hard science fiction. It has gained a large and dedicated fanbase and has been adapted into a successful television series.