Strategically, though not quite geographically, space is just another environment for conflict. The caveat with respect to geographical parallels is the evident difference in scale--the "quantity that becomes quality"--between the Earth and its atmosphere and the remainder of the universe ( i.e., space). Notwithstanding the vast asymmetry between the terrestrial geographical environments and space, it is not entirely obvious that "the stars" or "the heavens" have strategic significance for contemporary defense planners. Threats originating from far beyond the Earth-Moon system may appear from beyond our solar system or even from beyond our galaxy. If they do, we will be fortunate if we are able even to note the approach of such threats, let alone be equipped to see them at launch. In the long run, the very long run indeed, the security of the human race most likely will depend upon its space power. The dinosaurs faced a grim prospect between emigration and extinction and were condemned technologically to the latter. Fortunately for us, the random menace from fast-moving alien objects in space would appear to pose far more severe a threat to life on Earth than does purposeful menace from alien civilizations that would be unschooled in the niceties of the Geneva Convention. An asteroid may just terminate the human experience and settle religious arguments, but at least in principle it is detectable, trackable, and possibly divertable. By way of caveat, any animate, purposeful, alien menace that could reach Earth from another solar system, let alone from another galaxy, can be assumed to be likely to enjoy a decisive technological edge for superior strategic effect.

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Gray, Colin S. "Space Power and the Revolution in Military Affairs: A Glass Half Full?." Air & Space Power Journal. XIII, No. 3 (Fall 1999). [ 2 quotes ]