Space law is that part of law that has a relation to international and national space activities. Space law was initially only an object of abstract discussion, even after the first flying objects reached space. However, with the launch of the first artificial satellite Sputnik I by the then USSR in October 1957, during the international geophysical year, it gained practical importance. Since then, the development of space law has followed technical progress. Among the sources of law for Satellite-based earth observation are at the international level primarily five international treaties concluded under the UN and five sets of principles framed by the General Assembly resolutions.