Flights to the Planets USA Pioneer IV V Space Block of 4 Stamps MNH China Le Nain and La Tour

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Flights to the Planets USA Pioneer IV V Space Block of 4 Stamps MNH China Le Nain and La TourFlights to the Planets USA Pioneer IV V Space Block of 4 Stamps MNH Pioneer 4 was an American spin stabilized unmanned spacecraft launched as part of the Pioneer program on a lunar flyby trajectory and into a heliocentric orbit making it the first probe of the United States to escape from the Earth's gravity. It carried a payload similar to Pioneer 3: a lunar radiation environment experiment using a GeigerMller tube detector and a lunar photography