Pioneer 10, 11 - MSN Encarta

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Pioneer 10 & 11
Pioneer 10 was launched on 2 March 1972 as the first use of the Atlas-Centaur rocket as a three-stage launch vehicle. The third stage was required to rocket Pioneer 10 to the ...
Pioneer 10, 11 Quicklook
Pioneer 10, 11 Part of the Pioneer program Pioneers 10 and 11 were the first spacecraft to visit Jupiter (Pioneer 10 and 11) and Saturn (Pioneer 11 only).
NASA - Pioneer
The Pioneer Project → The Pioneer series of spacecraft performed first-of-their-kind explorations of the Sun, Jupiter, Saturn and Venus.

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Pioneer 10, 11, space probes. These were the first deep-space probes, both flying past Jupiter. Pioneer 11 continued on to pass Saturn. They were launched on March 2, 1972 and April 5, 1973 respectively by the United States.