By Jove

Abstract

The two Voyager spacecraft that flew by Jupiter in March and July 1979 discovered several unanticipated things: a many-particle ring close to Jupiter, a new satellite at the edge of the ring, active sulfur volcanoes on the satellite Io, lightning and auroras on Jupiter (the latter generated by particles from Io's orbit), and turbulence that acts to increase rather than decrease the energy of Jupiter's large-scale cloud motions. Besides their intrinsic interest, these discoveries help us understand related phenomena on the sun, the earth and other planets, and provide clues about how the solar system began and how it is evolving.

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