In this paper, we present a current situation of the cooled sensors in the space domain. Thus, we present an immediate image of the recent developments of the cooled technology, a discussion about the relevance of using cold sensors in the spatial domain and influence of the position of sensor in the satellite. To finish, we shall present an example of future mission. It will be about the space telescope James Webb. We shall expose then the scientific objectives, the concerned space agencies and the date of launch. We shall also give information onto the cooled sensors.