"The Long Voyage" by Carl Jacobi is a science fiction novel written in the mid-20th century. The story revolves around a group of couples who embark on an exploratory journey through space, seeking a new planet to colonize. Their voyage leads them to several barren planets, a struggle for power among the crew, and unexpected discoveries about their true situation. The narrative follows Navigator Norris and his band of passengers as they traverse various planets in search of animal life, suitable for habitation. Tensions rise as the ambitious Mason challenges Norris's authority, pushing for mutiny over the increasingly dire circumstances. As they dive into the enigmatic ruins of ancient civilizations on one of the planets, they uncover shocking truths about their mission, revealing that their journey is not through space but rather through time, raising questions about their existence and future. The culmination of these events pivots on a significant revelation that connects their expedition to the fate of both Earth and their own lives, showcasing themes of ambition, survival, and the moral dilemmas of their situation. (This is an automatically generated summary.)