Scholars focusing on international relations generally or foreign policy decision making are now paying increasing attention to the ways in which mental constructs—ideas, beliefs, ideologies, or worldviews—affect political actors' perceptions and behavior. The influence of mental constructs in political interaction is particularly visible when actors are trying to extend interaction into new areas or to establish new modes of cooperation. This study will illuminate the impact of mental constructs in these situations by examining the development of outer space law. The Soviets' successful launch of Sputnik in October 1957 shifted outer space from the realm of science fiction and speculation to the realm of real international concerns. Governments were faced with the problem of determining not only what they wanted to do in space but also what sorts of rules for unilateral activity and mutual interaction should prevail there.