On Friday 29 September, the European Space Agency opened the doors of the ESA Centre for Earth Observation, ESRIN, to host the ESA Open Day in the framework of the European Researchers' Night. With a full program of presentations, interviews, interactive games, hands-on workshops and various activities, more than 1400 people, among adults and children, had the opportunity to deepen their knowledge of the activities and programs in which ESA is involved every day.