When Galileo met Ganymede

Article Abstract:

Data from NASA's Galileo spacecraft indicates that Jupiter's satellite, Ganymede has a strong magnetic field. Internal dynamos operating through induction may have been responsible for activating this magnetism. Tidal heating may be responsible for the vigorous motions within the iron core of the satellite. It may have triggered additional differentiation. This may have reset the thermal evolution clock of Ganymede so that it appears to be only a million years old, although its true age is 4.5 billion years.

Cover Story, Discovery and exploration, Ganymede (Satellite), Space flight to Jupiter, Jupiter flights

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How special is Jupiter?

Article Abstract:

Constant depletion of gases around a young star inhibits the formation of large planets, suggesting the formation of larger planets such as Jupiter and Saturn to be an unusual phenomenon. All the existing theoretical models fail to explain the planet formations, implying the need for a more explanatory hypothesis. This hypothesis should explain the formation of gas giant planets such as Jupiter in planetary systems, probably induced by some abnormal, random circumstances.

Origin, Planet formation

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The subtle taste of Jupiter

Article Abstract:

A probe from the Galileo spacecraft reveals that Jupiter has lower amounts of sulphur, helium, neon, and oxygen in the form of water than previously believed. There is an abundance of hydrogen, high levels of krypton, and xenon. The oxygen-hydrogen ratio in the deepest regions is equal to that in the Sun. There are high east-west winds even at the greatest depths. Galileo will study Jupiter's satellites, starting with Ganymede in June 1997.

Analysis, Jupiter probes

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