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The United Nations (UN) is a diplomatic and political [2] international organization with the intended purpose of maintaining international peace and security, developing friendly relations among nations and countries, achieving international cooperation, and serving as a center for coordinating the actions of member states. [3]
It detected 339 X-ray sources in its 2.5-year lifetime. [4] The Einstein Observatory, launched in 1978, was the first imaging X-ray observatory. It obtained high-resolution X-ray images in the energy range from 0.1 to 4 keV of stars of all types, supernova remnants, galaxies, and clusters of galaxies.