The Expanse is a series of science fiction novels written by James S.A. Corey. Set in a future where humanity has colonized the solar system, the story follows a diverse cast of characters as they navigate political tensions, interplanetary conflicts, and the discovery of a mysterious alien protomolecule. The Expanse is a thrilling and expansive space opera that combines elements of hard science fiction, political intrigue, and action-packed adventure. The series has gained a dedicated fanbase and has been adapted into a successful television series.