The crew of the space mission Artemis II have returned to Earth after travelling 406,771 kilometres to the far side of the moon, the furthest any human has ventured into space so far. ADVERTISEMENT ADVERTISEMENT Experts are working to understand the impact of such trips on the human body, as space missions become more frequent and longer — and the health risks involved go far beyond anything faced on Earth. NASA has identified five hazards of spaceflight, including radiation, isolation and