I have previously published a post on the effects of space-travelling in astronauts, particularly concerning eyes and vision. This month, a group of researchers from the UC Irvine have published their study on the effects of space radiation in the brain and cognition. When travelling to Mars, astronauts are exposed to charged particles of the galactic cosmic rays, which can cause cell and tissue damage throughout the body. To find out the consequences of radiation in the brain, the team exposed mice to heavy ion irradiation and then examined their neuronal tissue and task performance. Their results revealed that these particles markedly and persistently change the structure of neurons and neurotransmission, leading to cognitive deficits. Furthermore, the intensity of damage correlates significantly with impairment in task performance, namely new object recognition and location. Thus, this work suggests exposition to space radiation can cause cognitive impairments which might be dangerous during the mission to Mars. Definitely, we are not adapted for the outer space. Yet.