Viewpoint: Extraterrestrial National Territory and the International System

Analysis of the probable effects of ending the prohibition against sovereign national extraterrestrial territory in the Outer Space Treaty points to large increases in the total territories of a small number of spacefaring states as they compete in a succession of annexations that move from celestial body to celestial body. Rather than result in an increased chance of war between spacefaring states—an argument deployed by defenders of the Outer Space Treaty—extraterrestrial annexations would instead reduce its likelihood, both in the near-term because of the mutual vulnerability of human spacecraft and bases, and over the long-term by making spacefaring states less vulnerable to terrestrial warfare.