Probes to the Planets:Where We've Been on Our Journey
Shorthly after the beginning of the Space Age, in the late 1950s, rocketeers in the USA and the USSR realized that their primitive, military-derived rockets could escape the gravitational field of the Earth, navigate by the stars to cruise the depths of interplantety space, and begin the preliminary reconnaissance of the solar system. This was a very heady time for space scientist—war rockets, launched iln a superpower competition, would actually be used to study, at close range, properties of distant worlds.
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