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Ganymede, or Jupiter III, is the largest and most massive natural satellite of Jupiter, and in the Solar System.Despite being the only moon in the Solar System with a substantial magnetic field, it is the largest Solar System object without a substantial atmosphere.
On 8 September 2014, NASA reported finding evidence of plate tectonics on Europa, a satellite of Jupiter—the first sign of subduction activity on another world other than Earth. [2] Titan , the largest moon of Saturn , was reported to show tectonic activity in images taken by the Huygens probe , which landed on Titan on January 14, 2005.
There are two Io-Europa conjunctions (green) and three Io-Ganymede conjunctions (grey) for each Europa-Ganymede conjunction (magenta). This diagram is not to scale. In celestial mechanics , orbital resonance occurs when orbiting bodies exert regular, periodic gravitational influence on each other, usually because their orbital periods are ...
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
Greek; where Ganymede was abducted by Zeus disguised as an eagle. WGPSN: Dukug Sulcus: 385: 1985: Sumerian holy cosmic chamber of the gods. WGPSN: Elam Sulci: 1,855: 1985: Ancient Babylonian seat of sun worship, in present-day Iran. WGPSN
Magnetic reconnection is a breakdown of "ideal-magnetohydrodynamics" and so of "Alfvén's theorem" (also called the "frozen-in flux theorem") which applies to large-scale regions of a highly-conducting magnetoplasma, for which the Magnetic Reynolds Number is very large: this makes the convective term in the induction equation dominate in such regions.
Epigeus is the largest known impact crater on Jupiter's Galilean satellite Ganymede, with a diameter of 343 km. It is 6.5% the mean equatorial diameter of Ganymede, 5,270 km (3,270 mi). It is 6.5% the mean equatorial diameter of Ganymede, 5,270 km (3,270 mi).
In his 1805 book Celestial Mechanics, in addition to laying out his mathematical argument for the resonant orbits of Io, Europa, and Ganymede, Laplace was able to use perturbations on the orbit of Io by Europa and Ganymede to provide the first estimate of Io's mass, 1.73 × 10 −5 of the mass of Jupiter, which was one-quarter of the modern value.