Space law is a real, existing field of law, but it’s only beginning to touch on the complexity of property rights in space. The Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies is the international treaty that addresses these issues, but current events suggest that we may soon reach the limits of its provisions. What happens when Elon Musk tries to sell you a condo on Mars?