The Pioneer series was initiated to explore the space environment in the vicinity of the moon. Pioneers 1, 2, and 5 were assigned to the Space Technology Laboratories, Inc. and used the Thor-Able launch vehicle; Pioneers 3 and 4 were assigned to the Army Ballistic Missile Agency and the Jet Propulsion Laboratory (JPL). Pioneers 3 and 4 were launched by Juno II vehicles. Pioneer 3 was launched on 6
- द्वारा Space Technology Laboratories (STL)
- श्रेय: Gift of the Jet Propulsion Laboratory
- अधिकार: CC0
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