who were behind the designing of it?
UNANSWERABLE
what is magnetosphere of jupiter? The cavity created in the solar wind by the planet's magnetic field how big is the cavity? It extends up to seven million kilometers in the Sun's direction and almost to the orbit of Saturn in the opposite direction which scientist discovered it? UNANSWERABLE were there any exploration done to study on this? Until 2009 eight spacecraft have flown around Jupiter including Pioneer 10, Pioneer 11, Voyager 1 and  Voyager 2 any spacecraft which carried passengers? No. Only automated spacecraft have visited Jupiter has the second one explored any other planets? Yes. Saturn anything remarkable about its history? It was the first to be designed for exploring the outer Solar System
wiki:25661118
Pioneer 11 [SEP] History
Approved in February 1969, "Pioneer 11" and its twin probe, "Pioneer 10", were the first to be designed for exploring the outer Solar System. Yielding to multiple proposals throughout the 1960s, early mission objectives were defined as: Subsequent planning for an encounter with Saturn added many more goals: "Pioneer 11" was built by TRW and managed as part of the Pioneer program by NASA Ames Research Center. A backup unit, Pioneer H, is currently on display in the "Milestones of Flight" exhibit at the National Air and Space Museum in Washington, D.C.. Many elements of the mission proved to be critical in the planning of the "Voyager" program.