The Dark Beyond the Stars (1991)

The Astron has spent two thousand years searching for alien life, while its ageing fabric places increasingly severe limits on what the crew can endure. An immortal captain’s determination comes into conflict with people who must live inside the consequences of his mission. Choose it for maintenance as a moral question: when does persistence stop serving the community? Sparrow’s uncertain memory adds a personal mystery to a tense, psychologically focused voyage.