This unique lexicon features over 3,500 astronautical terms, listed alphabetically in English, with their Irish translation. It is a stand-alone edition based on a 20-language lexicon prepared by the International Academy of Astronautics on the occasion of its 50th anniversary in 2010. The book contains a comprehensive introductory essay, providing background information on the International Academy of Astronautics and its work to develop a multi-lingual lexicon of space-related terminology. The introduction also discusses the astronomical heritage of Ireland, the Irish language, the method of translation adopted in preparing the present English-Irish lexicon, and some of the practical problems encountered in translating scientific and technical terms into Irish.