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Whether Ganymede has an ionosphere associated with its atmosphere is unresolved. [24] Ganymede's surface is composed of two main types of terrain, the first of which are lighter regions, generally crosscut by extensive grooves and ridges, dating from slightly less than 4 billion years ago, covering two-thirds of Ganymede.
The largest, Ganymede, is the largest moon in the Solar System and surpasses the planet Mercury in size (though not mass). Callisto is only slightly smaller than Mercury in size; the smaller ones, Io and Europa, are about the size of the Moon. The three inner moons — Io, Europa, and Ganymede — are in a 4:2:1 orbital resonance with
Complex plasma interactions in Io's atmosphere create immense electrical currents which couple to Jupiter's atmosphere. [160] [247] Several lines of evidence from Galileo support the theory that liquid oceans exist under Europa's icy surface. [160] [247] Ganymede possesses its own, substantial magnetic field – the first satellite known to ...
A slight attenuation of the signal before and after the occultation showed that Io had an ionosphere, suggesting the presence of a thin atmosphere with a pressure of 1.0 × 10 −7 bar, though the composition was not determined. [33] This was the second atmosphere to be discovered around a moon of an outer planet, after Saturn's moon Titan.
Investigation of Ganymede's tenuous atmosphere; Study of Ganymede's intrinsic magnetic field and its interactions with the Jovian magnetosphere. For Europa, the focus is on the chemistry essential to life, including organic molecules, and on understanding the formation of surface features and the composition of the non-water-ice material ...
A radio-science experiment analyzed Ganymede's gravitational field and internal structure. The instruments detected evidence of a self-generated magnetosphere around the moon. G2 260 (161) 6 September 1996 A Ganymede gravity-assist put Galileo into coplanar orbit with other Galilean satellites, permitting subsequent encounters with them. A ...
The ionosphere bends radio waves in the same manner that water in a pool bends visible light. When the medium through which such waves travel is disturbed, the light image or radio information is distorted and can become unrecognizable. The degree of distortion (scintillation) of a radio wave by the ionosphere depends on the signal frequency.
Later, in 1678, Christiaan Huygens used these errors to make the first accurate determination of the speed of light. Spacecraft can be used to observe the solar eclipses on Jupiter; these include Pioneer 10 and Pioneer 11 (1973 and 1974), Voyager 1 and Voyager 2 (1979), Galileo orbiter (1995–2003), Cassini–Huygens (2000), New Horizons (2007 ...
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