Space observations are recorded by the NORAD Space Detection and
Tracking System (SPADATS) and a Navy counterpart, the Naval Space
Surveillance System (NAVSPASUR). These systems track and maintain
element sets on approximately 5,000 man-made, catalogued objects in
space. Approximately 25,000 observations are sent to the NORAD Space
Defense Center each day from the sensor systems. Most of these
observations are directly correlated to catalogued objects. The ones
that are not correlated are not necessarily all genuine UFOs. A great
majority are either satellites too small to track or debris from
satellite break-ups.
Estimates vary, but several thousand catalogued objects are orbiting
the earth at present. These objects and the continuous need to update
the element sets of catalogued objects due to natural phenomena are the
largest contributors of uncorrelated observations. A certain percentage
are never correlated with known objects and can literally be called
unidentified flying objects or, in this case, "unidentified orbiting
objects."
According to NORAD, between SPADATS and NAVSPASUR approximately
ten million uncorrelated observations have been collected over the last
twenty years. If we were to take the usual estimates of the percentage
of true unknowns from all UFO reports sent to various sources, we are left with
roughly five percent being unknowns. This agrees well with the government's
figures. [5.479452054795% unknown]
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