The investigation of emotions is an important field in space psychology studies. In space flight, dealing with emotions is crucial for an astronaut’s own performance, well-being and interpersonal relationships. EIEE is an experiment by the Austrian Space Forum that aims to investigate which emotions analog astronauts experience during a mission in an extreme environment. It will also investigate which strategies they use to deal with these emotions and how these strategies change under stressful situations. For this purpose, the analog astronauts will complete quantitative questionnaires on emotion regulation, answer questions about emotions in a diary or audio log and keep track of their emotions and their intensity in a list.