The furthest from Earth any human has ever been is lunar orbit; no one has ever been to Jupiter. Furthermore, no one is ever likely to "explore on Jupiter"; it's extremely inhospitable to humans in many ways. It's somewhat more likely that humans may someday visit Jupiter's moons, in particular Callisto (the radiation levels on the other Galilean moons are far too high, with Ganymede's radiation levels being about 100x as much as on Earth, and Io and Europa have even higher levels than that).
All the robotic probe missions to Jupiter thus far have been at least primarily NASA (US) efforts, though the European Space Agency has a planned mission that's expected to launch in 2022 and reach Jupiter around 2030.
yes it have been explored 10 times but people have not yet walked on jupiter
in 1973
Aliens
Galileo.
yes
Voyager 1 explored Jupiter in 1979, and made its closest approach on March 5, 1979.
Voyager 1 & 2 reached Jupiter in 1979 and Galileo arrived at Jupiter in 1995.
63
yes
We have sent probes such as the "Voyagers" and "Galileo".
Space Probes.
Jupiter ;)