The quest for a theory of spacepower is a useful enterprise. It is based on the proposition that before one can intelligently develop and employ spacepower, one should understand its essence. It is also based on the historical belief that, over the long haul, military practice has generally benefited from military theory.1 While such a conviction is generally true, this happy state has not always been realized. Faulty theory has led to faulty practice perhaps as often as enlightened theory has led to enlightened practice.2 This does not necessarily call into question the utility of theory per se, but it does reinforce the need to get it about right. Taking the broader view, it is a trait of human nature to yearn for understanding of the world in which we live; and when a relatively new phenomenon such as spacepower appears on the scene, it is entirely natural to seek to comprehend it through the use of a conceptual construct. Thus, one can at least hope that the common defense will be better provided for by having a theory of spacepower than by not having one.