Before humanity can reach the moon again or set foot on Mars, it must first understand what confinement does to the human spirit and body over time. NASA is seeking four volunteers to spend a year inside two connected habitats in Houston, simulating both the transit and surface phases of deep-space exploration — a quiet, unglamorous mission that will shape the safety and survival of those who one day make the real journey. It is the kind of work that history rarely remembers by name, yet without which the grander story cannot be written.