Goedhuis, D. Keywords: Space | Borders | Delimitation | Mots clefs: Espace cosmique | Frontières | Délimitation | ABSTRACT In this course, Daniel Goedhuis, Professor at the University of Leiden, presents the main problems related to space and air law. After an introduction to the divergent interpretations of the legal regimes governing sky and space that came into force in the 1970s, and to various conventions in these fields, the author focuses on the delimitation of sky and space. Dans ce cours, Daniel Goedhuis, professeur à l'Université de Leyde, présente les principaux…