Definition of the term 'space surveillance ' per official documentation of the United States Department of Defense.
space surveillance
The observation of space and of the activities occurring in space. This mission is normally accomplished with the aid of ground-based radars and electro-optical sensors. This term is separate and distinct from the intelligence collection mission conducted by space-based sensors which surveil terrestrial activity. See also space; space control. (JP 3-14) (US DoD)
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