have they built any station at space?
Yes. International Space Station
NASA
The International Space Station (ISS) combines NASA's Space Station "Freedom" project with the Soviet/Russian "Mir-2" station, the European "Columbus" station, and the Japanese Kibō laboratory module.
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 who were behind the designing of it? UNANSWERABLE how was their venture honored? It was honored on one of 10 United States Postage Service stamps commemorating unmanned spacecraft exploring each of the then nine planets and the Moon is there any plaque or symbol made for pioneer? Yes. A gold-anodized aluminum plaque featuring the nude figures of a human male and female along with several symbols that are designed to provide information about the origin of the spacecraft any reason behind for making it? IT carries the plaque in the event that either spacecraft is ever found by intelligent lifeforms from other planetary systems which space organization has been carrying out these missions? NASA
wiki:15224156
NASA [SEP] International Space Station (1993–present)
The International Space Station (ISS) combines NASA's Space Station "Freedom" project with the Soviet/Russian "Mir-2" station, the European "Columbus" station, and the Japanese Kibō laboratory module. NASA originally planned in the 1980s to develop "Freedom" alone, but US budget constraints led to the merger of these projects into a single multi-national program in 1993, managed by NASA, the Russian Federal Space Agency (RKA), the Japan Aerospace Exploration Agency (JAXA), the European Space Agency (ESA), and the Canadian Space Agency (CSA). The station consists of pressurized modules, external trusses, solar arrays and other components, which were manufactured in various factories around the world, and have been launched by Russian Proton and Soyuz rockets, and the US Space Shuttles.