Nebula Public Library

Human exploratory missions to the Moon or Mars are widely considered as the next logical steps in human space exploration and, lately, settlement. Such space exploration or settlement activities involve humans spending long periods of time in space and, with increasing distance from Earth, no abort possibilities. Crews on such missions have to be self- sufficient, not only concerning food, drink and waste, but also with respect to medical treatment. Health issues are raised by the environmental conditions in space, such as the influence of altered gravity, radiation and isolation.