 Space medicine. Space medicine is the practice of medicine on astrotnots in outer space whereas astronomical hygiene is the application of science and technology to the prevention or control of exposure to the hazards that may cause astronaut till health. Both these sciences work together to ensure that astrotnots work in a safe environment. The main objective is to discover how well and for how long people can survive the extreme conditions in space, and how fast they can adapt to the Earth's environment after returning from their voyage. Medical consequences such as possible blindness and bone loss have been associated with human space flight. In October 2015, the NASA Office of Inspector General issued Health Hazards Report related to space exploration, including a human mission to Mars.