3-Folds in P5 of degree 12of degree 12 by Edelmann G.

By Edelmann G.

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The current Laplace resonance is unable to pump the orbital eccentricity of Ganymede to a higher value. 0013 is probably a remnant from a previous epoch, when such pumping was possible. The ganymedian orbital eccentricity is somewhat puzzling; if it is not pumped now it should have decayed long ago due to the tidal dissipation in the interior of Ganymede. This means that the last episode of the eccentricity excitation happened only several hundred million years ago. 0015 on average—the tidal heating of this moon is negligible now.

However, in 1979 Voyager 1 observed an occultation of a star (κ Centauri) during its flyby of the planet, with differing results. The occultation measurements were conducted in the far-ultraviolet spectrum at wavelengths shorter than 200 nm; they were much more sensitive to the presence of gases than the 1972 measurements in the visible spectrum. No atmosphere was revealed by the Voyager data. 5 µPa. The latter value is almost five orders of magnitude less than the 1972 estimate. Despite the Voyager data, evidence for a tenuous oxygen atmosphere (exosphere) on Ganymede, very similar to the one found on Europa, was found by the Hubble Space Telescope (HST) in 1995.

83 g/cm3. Compounds detected spectroscopically on the surface include water ice, carbon dioxide, silicates, and organic compounds. Investigation by the Galileo spacecraft revealed that Callisto may have a small silicate core and possibly a subsurface ocean of liquid water at depths greater than 100 km. The surface of Callisto is heavily cratered and extremely old. It does not show any signatures of subsurface processes such as plate tectonics or volcanism, and is thought to have evolved predominantly under the influence of impacts.

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