Scope and Contents Scientists have found that astronauts returning from extended lunar landings may face difficulties readapting to Earth's gravitational field. Studies show that prolonged exposure to low gravity can lead to deterioration in various anatomical subsystems and physiological functions. Muscles, bones, the cardiovascular system, urinary system, gastrointestinal system, and neurological system are all affected by the lack of gravitational stimuli. To prevent physical deterioration, astronauts are...