The two Voyager encounters with Jupiter were periods unparalleled
in degree and diversity of discovery. We had, or course, expected a
number of discoveries because we had never before been able to
study in detail the atmospheric motions on a planet that is a giant
spinning sphere of hydrogen and helium, nor had we ever observed
planet-sized objects such as the Jovian satellites Ganymedes and
Callisto, which are half water-ice. We had never been so close to a
Moon-sized satellite such as lo, which was known to be dispersing
sodium throughout its Jovian neighborhood and was thought to be
generating a one-million-ampere electrical current that in some way
results in billions of watts of radio emission from Jupiter.
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