Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p22a..01j&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P22A-01
Astronomy and Astrophysics
Astronomy
5400 Planetology: Solid Surface Planets, 5410 Composition, 5418 Heat Flow, 5480 Volcanism (8450), 6218 Jovian Satellites
Scientific paper
Io is one of the four satellites of Jupiter discovered by Galileo in 1610, and it has played a major role in the history of astronomy and planetary science ever since. Timing of its eclipses by Jupiter, along with the other Galilean moons, provided the first measurement of the speed of light by Roemer. The importance of resonances in celestial mechanics was demonstrated by Laplace's study of the system. The discovery that Io's orbital position controls decametric radio emissions from Jupiter's magnetosphere was the first hint of the strong interactions between giant planet magnetospheres and the satellites embedded within them. Io's bizarre optical properties led to similarly bizarre hypotheses concerning its surface composition and history. Voyager's initial reconnaissance in 1979 led to the discovery of the first active volcanism beyond Earth and recognition of tidal heating as a major energy source for Io. The Galileo mission, originally not slated to study Io due to hazards from Jupiter's radiation belts, has vastly increased our understanding of Io through a remarkable series of distant observations and daring close encounters over the course of its six-plus year mission. This talk will review our changing view of this strange world, Io, the most volcanic world in the solar system, whose map is now emblazoned with the names of gods and goddesses of volcanoes and fire from Earth's diverse cultures.
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