Moon, and Venus (and these are all much closer than Jupiter).
JupiterΓÇÖs temperatures create conditions unlike anything known on Earth; in some places atmos- pheric pressure is so great that hydrogen, normally a light, tenuous gas, has metallic properties. The rapid rotation of this metallic hydrogen creates a magnetic field many times stronger than that of Earth.
Like Saturn, Jupiter has moons ΓÇöat least 16 of themΓÇöand, sur- prisingly, a ring. Some of JupiterΓÇÖs moons were discovered by Galileo in 1610, while the ring and a number of other moons were first identified by the Voyager spacecraft in 1979 and 1980.
