All the rest of the planets in the solar system don't add up to a single Jupiter.
The Jupiter pages at LANL, SEDS JPL, and NSSDC.
Galileo is the first spacecraft to go into orbit around a Jovian planet. It dropped a probe into Jupiter's atmosphere in December of 1995; the people of Earth touched a Jovian planet for the first time. The Galileo spacecraft page at JPL. The latest Galileo news is here. The Galileo imaging page at JPL.
Voyager was the name of two spacecraft that flew past many Jovian planets, and have now left the solar system. the main Voyager site is from JPL, which controlled it. Each voyager carried a golden record, to represent humankind. This is a list of the material placed on that record, intended to communicate a story of our world to extraterrestrials who might come across it billions of years from now.
In many ways these are more interesting than Jupiter itself, since their solid surfaces reveal the ancient history of the outer solar system, and one of them, Europa, may have liquid water, and so possilby life.