Humanity has the knowledge to solve its problems but lacks the moral insight to implement these ideas on a global scale. New moral insight can be obtained through transformative experiences that allow us to examine and refine our underlying preferences, and the eventual landing of humans on Mars will be of tremendous transformative value. Before such an event, I propose that we liberate Mars from any controlling interests of Earth and allow Martian settlements to develop into a second independent instance of human civilization. Such a designation is consistent with the Outer Space Treaty and allows Mars to serve as a test bed and point of comparison by which to learn new information about the phenomenon of civilization. Rather than develop Mars through a series of government and corporate colonies, let us steer the future by liberating Mars and embracing the concept of planetary citizenship.Keywords: space policy, Mars exploration and settlement, space colonization, transformative value, planetary citizenship EXTENDING OUR MORALITY Technological solutions to humanity's major problems are known. Climate change can be addressed through a strategy of mitigation, adaptation, and (if needed) geoengineering in order to reduce our emissions and find cleaner sources of energy 1,2 . The "tragedy of the commons" that arises from an overpopulated planet can be alleviated through voluntary restrictions on breeding and changes in personal lifestyle 3 . Humanity can even survive longterm changes in the sun by first engaging in geoengineering 4 and eventually migrating to space settlements [5][6][7] . But if we already possess the knowledge to overcome these challenges, then why do such problems persist?Ecologist Garrett Hardin noted that solving the population problem "requires a fundamental extension in morality" 3 , and similar claims can be made about our failed efforts to address climate change, poverty, economic injustice, and other global challenges. One resolution to this dilemma is Plato's "philosopher king" or a similar "benevolent dictator" who enacts fair and consistent solutions to global problems. Barring such a non-reality, humans must find a way to develop new moral tools that will help to reduce the environmental impact of our civilization. There is no shortage of suggestions for how humanity should extend its morality, and the problem is often reduced to choosing among competitors. Contemporary political, religious, economic, or philosophical discourse is