 Space travel can also have a profound impact on the psyche of the crew members as delineated in anecdotal writings composed after their retirement.Space travel can adversely affect the body's natural biological clock (circadian rhythm); sleep patterns causing sleep deprivation and fatigue; and social interaction; consequently, residing in a Low Earth Orbit (LEO) environment for a prolonged amount of time can result in both mental and physical exhaustion.Long-term stays in space reveal issues with bone and muscle loss in low gravity, immune system suppression, and radiation exposure.