As political and military leaders ponder the future of space operations, the time has come to frame propositions regarding space power. Specifically, the author seeks to answer the question, "What is the nature of space power?" Two points come immediately to the forefront of this work. First, space power is different from airpower even though both share the vertical dimension of warfare. Second, space operations have matured to a point wherein valid and unique propositions regarding space power are identifiable. The objective of this work is to stimulate discussions and encourage those who do not yet understand or appreciate the nature of space power in modern warfare