In his book, Dark Skies: Space Expansionism, Planetary Geopolitics, and the Ends of Humanity (Oxford University Press, 2020), Daniel Deudney argues that the expansion of humanity into space will pose unacceptable existential risks for our civilization and, perhaps, our species. Of particular concern are risks of civilization-destroying interplanetary conflict and the rise of totalitarian forms of government, both on Earth and in space. This chapter argues that these risks, although deserving to be taken seriously, may be mitigated by appropriate institutional developments. Near-term possibilities include strengthening the United Nations to give that body greater responsibility for human activities in outer space, and/or the creation of a dedicated World Space Agency. Ultimately, the logic points towards stronger forms of planetary and interplanetary governance organized according to federal principles.