"The most marked alterations were observed for positive emotions such that we saw continuous declines from the start to the end of the mission, without evidence of a 'bounce-back effect' as participants were preparing to return home..." via Study Finds Org Houston — Long-term space travel could lead to a spiral into mental health problems for astronauts mired in loneliness, according to research carried out on isolated workers in the Antarctic. The study shows that after long periods of time there was a lack of positive emotions and no "bounce-back" effect even when the workers were preparing to go home. Researchers say this could endanger future space missions, as positive emotions and hope are crucial to returning in a high-pressure environment like a spacecraft. Scientists from the University of Houston came up with a checklist for detecting mental health changes in isolated, confined, and extreme (ICE) environments, and asked people working on two Antarctic stations to self-report