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Photograph
The NTS-2 Development Team at the Naval Research Laboratory.
Illustration
This illustration shows the important components of the NTS-2 satellite.
Artifact
Unflown duplicate of Pioneer 4, an early satellite designed for lunar exploration.
Photograph
Wernher von Braun, John Casani, and James Van Allen inspect the Pioneer 4 satellite.
Illustration
Trajectory of Pioneer 4 from the Earth and past the Moon into orbit around the Sun.
Illustration
Pioneer 4 achieved enough velocity to escape Earth’s gravity, but its trajectory past the Moon was off by a wide margin.
Photograph
Engineers discussing the Global Positioning System.
Illustration
All three (positioning, navigation, and timing) are used together with map data and other information (weather or traffic data, for instance) in modern navigation systems.
Artifact
The PLGR was smaller and lighter than the older Manpack GPS receiver.
Artifact
This prototype satellite signal receiver was developed around 1976.