In this innovatory book Daniel Sage analyses how and why American space exploration reproduced and transformed American cultural and political imaginations by appealing to, and to an extent organizing, the transcendence of spatial and temporal frontiers. In so doing, he traces the development of a seductive, and powerful, yet complex and unstable American geographical imagination: the 'transcendental state'. Historical and indeed contemporary space exploration is, despite some recent notable exceptions, worthy of more attention across the social sciences and humanities. While largely engaging with the historical development of space exploration, it shows how contemporary cultural and social, and indeed geographical, research themes, including national identity, critical geopolitics, gender, technocracy, trauma and memory, can be informed by the study of space exploration.