How is outer space governed? This article argues that private authority is gaining salience in space politics, even with respect to the traditionally state-centric security and military aspects of space. Further, while commercial actors have always played a role in space programs, three significant changes can be detected: transnational conglomerates and consortia as opposed to individual corporations are emerging as key partners in space politics; private partners are gaining stronger and wider responsibilities for the development and management of space programs (including manned spaceflights); and public accountability is increasingly at stake due to a widening of security in space policy. The latter development includes a blurring of key distinctions between military and civilian usage (also referred to as dual-use or dual-role application), as well as between the public and private realms.