UM POUCO DA HISTORIA DO PROJETO NAVSTAR E AS 4 MAIS CONSTELAÇÃAO DE SATELITES
Navstar 7, also known as GPS I-7 and GPS SVN-7, was an American navigation satellite which was lost in a launch failure in 1981. It was intended to be used in the Global Positioning System development program. It was the seventh of eleven Block I GPS satellites to be launched, and the only one to fail to achieve orbit.
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