For centuries the exact measurements of distances to fara- way stars were impossible to determine, and the make-up of the milky Way remained a riddle. today the Gaia space- craft, whose mission began in late 2013, is creating an exact three-dimensional map of the Galaxy. Discover the history of research on our corner of the Universe in a film the heavens of Copernicus and other European planetariums made in coop- eration with the European space agency (Esa).