| | Abstract: This chapter focuses on the invention of flying saucers, and the comparison between the ‘ghost rockets’ that appeared in the European skies in 1946 and the ‘flying discs’ that were seen in the United States a year later. UFOs were spotted at a time when scientific cultures changed considerably, a time in which scientists were professionals and not amateurs. By comparing the situation of science vis-à-vis sky anomalies in Europe at the end of the nineteenth century and sky anomalies in the United States in 1947, the chapter argues that the differences are attributable to different definitions of science, the relation of science and amateurs, and the attitude of science regarding certain anomalies. |