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18 Marzo, 2006 13:26
Esta fué una de las kafetas con temática principal a tratar. Solíamos proponer un término o concepto y la gente se curraba unos vídeos con posterior discusión, una performance o lo que se ocurriese, estaban muy bien.
13/01/2010, 05:16
The heating mechanism required for the formation of the grooved terrain on Ganymede is pearls an unsolved problem in the planetary sciences. The modern view is that the grooved terrain is mainly tectonic in nature. Cryovulcanism is thought to have played only a minor role, if any. The forces that caused the strong stresses in the ganymedian ice lithosphere necessary to initiate the tectonic activity may be connected to the tidal heating events in the past, possibly caused when the satellite passed through unstable orbital resonances. The tidal flexing of the ice may have heated the interior and strained the lithosphere, leading to the development of cracks and horst and graben faulting, which erased the old, dark terrain on 70% of the surface. The formation of the grooved terrain may also be connected with the early core formation and subsequent tidal heating of the moon's interior, which may have caused a slight expansion of Ganymede by 1–6% due to phase transitions in ice and thermal expansion. During subsequent evolution deep, hot water plumes may have risen from the core to the surface, leading to the tectonic deformation of the lithosphere. Radiogenic heating within the satellite is the most relevant current heat source, contributing, for instance, to thickness of the ocean. Research models have found that if the orbital eccentricity were an order of magnitude greater than current (as it may have been in the past), tidal heating would be cuff links a more substantial heat source than radiogenic heating.
28/02/2011, 06:56
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27/02/2012, 12:02
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