The Cologne Commentary on Space Law is a three-volume annotation on the written norms of space law as enunciated through the Treaties of the United Nations and its General Assembly Resolutions. Volume I focuses on the 1967 Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, popularly known as the 'Outer Space Treaty'. A broad international authorship of twenty experts addresses the historical overview and provides a provision by-provision interpretation of the Outer Space Treaty. This Volume also includes insights into the subsequent State practice, present-day applicability and future perspectives of the Treaty. The other four UN Treaties, the 1968 Rescue Agreement, the 1972 Liability Convention, the 1975 Registration Convention and the 1979 Moon Agreement, are addressed in Volume II, which was published in 2013. Volume III (published in 2015) delves into the eight most relevant United Nations General Assembly Resolutions/Principles on space activities. On the occasion of the 50th anniversary of the Outer Space Treaty, Volume I of the Cologne Commentary on Space Law has been translated into Russian.