Space travel can affect the human body in various ways due to factors such as microgravity, radiation exposure, and psychological stress. Extended periods in space can lead to muscle atrophy, bone density loss, cardiovascular changes, and impaired immune function. Astronauts may also experience vision problems, sleep disturbances, and psychological issues such as depression and anxiety. Understanding these effects is essential for ensuring the health and safety of astronauts on long-duration space missions, including those planned for deep space exploration and eventual missions to Mars and beyond.