Space is again in the headlines. E-billionaires Jeff Bezos and Elon Musk are planning to colonize Mars. President Trump wanted a "Space Force" to achieve "space dominance" with expensive high-tech weapons. The space and nuclear arms control regimes are threadbare and disintegrating. Would-be asteroid collision diverters, space solar energy collectors, asteroid miners, and space geo-engineers insistently promote their Earth-changing mega-projects. Given our many looming planetary catastroph...

Would-be asteroid collision diverters, space solar energy collectors, asteroid miners, and space geo-engineers insistently promote their Earth-changing mega-projects. Given our many looming planetary catastrophes (from extreme climate change to runaway artificial superintelligence), looking beyond the earth for solutions might seem like a sound strategy for humanity. And indeed, bolstered by a global network of fervent space advocates—and seemingly rendered plausible, even inevitable, by o...

By the last decade of the twentieth century, the great questions of modernity seemed to be answered. With the collapse of the Soviet Union and global communism, the liberal democratic capitalist project seemed to be the only one left standing, and in the 1990s the "liberal ideal" spread worldwide. Today, of course, this universalistic narrative rings hollow. The global distribution of power has shifted and the preeminence of the West is receding as new directions for world order emerge. Ch...

Realism, the dominant theory of international relations, particularly regarding security, seems compelling in part because of its claim to embody so much of Western political thought from the ancient Greeks to the present. Its main challenger, liberalism, looks to Kant and nineteenth-century economists. Despite their many insights, neither realism nor liberalism gives us adequate tools to grapple with security globalization, the liberal ascent, and the American role in their development. I...