On the Moon or Mars, where even the oxygen you breathe is made in a manufacturing process controlled by someone else, can you be free? In Interplanetary Liberty: Building Free Societies in the Cosmos, Charles S. Cockell argues that beyond Earth, space is especially tyranny-prone. Yet rather than consign humanity to a dim future of extraterrestrial despotisms, he suggests that the construction of free societies is possible using uniquely blended and reformulated classical liberal ideas for the space frontier. Considering politics, science, engineering, art, education, prisons, and other facets of society, this book lays out the general ethos and culture around which settlements might be constructed to secure the establishment and flourishing of freedom in the cosmos.