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| Titel |
Planetary deep interiors, geodesy, and habitability |
| VerfasserIn |
Veronique Dehant |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100443
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| Publikation (Nr.) |
 EGU/EGU2014-16410.pdf |
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| Zusammenfassung |
| The evolution of planets is driven by the composition, structure, and thermal state of their
internal core, mantle, lithosphere, crust, and by interactions with possible ocean and
atmosphere. This presentation puts in perspective the fundamental understanding of the
relationships and interactions between those different planetary reservoirs and their evolution
through time. It emphasizes on the deep interior part of terrestrial planets and moons. The
core of a planet, when composed of liquid iron alloy, may provide magnetic field and further
interaction with the magnetosphere, ingredients believed to be important for the evolution of
an atmosphere and of a planet in general. The deep interior is believed to be of high
importance for its habitability.
Lander and orbiter, even rover at the surface of planets or moons of the solar system help
in determining their interior properties. First of all orbiters feel the gravity of the planet and
its variations. In particular, the tidal mass redistribution induces changes in the acceleration of
the spacecraft orbiting around a planet. The Love number k2 has been determined for Venus,
Mars, and the Earth, as well as for Titan and will be deduced for Mercury and for some of the
Galilean satellites from new missions such as JUICE (Jupiter Icy satellite Explorer).
The properties of the interior can also be determined from the observation of the
rotation of the celestial body. Radar observation from the Earth ground stations of
Mercury has allowed Margo et al. (2012, JGR) to determine the moments of inertia of
Mercury with an unprecedented accuracy. Rovers such as the MERs (Mars Exploration
Rovers) allow as well to obtain the precession and nutation of Mars from which
the moments of inertia of the planet and its core can be deduced. Future missions
such as the InSIGHT (Interior exploration using Seismic Investigations, Geodesy,
and Heat Transport) NASA mission will further help in the determination of Mars
interior and evolution, and thus in the understanding of the habitability of Mars. |
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