Slow Time Between The Stars by John Scalzi

In a universe where interstellar travel is possible but time dilation creates vast gaps between journeys, a group of explorers embarks on a mission to a distant star system, knowing they will return to a world that has aged centuries beyond their own experiences. As they navigate the challenges of space travel and the psychological toll of leaving everything they know behind, the crew must confront the profound implications of their journey on their relationships, identities, and the very fabric of human society. The narrative weaves together themes of isolation, the passage of time, and the enduring human spirit in the face of the unknown.