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Like any form of combat power, air power does not develop in isolation; nor is it static. Even
if there were no formal process linking its theoretical development and practical application
to other elements of national security, plainly it will remain responsive to a range of external
influences from the wider civil and military communities which combine to shape the
national security outlook.

The capabilities of existing and proposed future satellite sensors are examined for their ability to provide wide area surveillance of Australia, and recommendations are made regarding future potentials of space-based surveillance.

Space is often referred to as the 'fourth dimension' of warfare, characterised by its own doctrines, strategies and operations.