A 6–9 month journey to Mars pushes the human body to its limits. Muscle and bone loss, fluid shifts, vision problems, and immune changes all threaten astronaut health. Discover the physiological challenges of long-duration space travel and how future Mars explorers prepare to face them.

What are the psychological challenges of traveling to Mars? Explore real issues faced on the ISS—sleep disruption, isolation, stress—and the experiments preparing astronauts for deep space missions.