Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009epjwc...1..249e&link_type=abstract
ERCA 2008 - From the Human Dimensions of Global Environmental Change to the Observation of the Earth from Space, Grenoble, Franc
Physics
Scientific paper
The outer solar system extends beyond a heliocentric distance of 5 AU. It contains the giant planets and their systems (rings and satellites), the Kuiper belt, the comets (except those which approach episodically the inner solar system) and, at its outer edge, the Oort cloud. The outer solar system physically corresponds to the region located outside the « snow line » which corresponded to the distance of ice condensation in the protodolar disk, and thus made the frontier between the terrestrial and the giant planets at the time of the planets’ formation. The outer solar system is charaterized by a very large variety of ob jects, even within a given class of ob jects. Each of the giant planet has its own properties, as well as each of the outer satellites and the ring systems ; all are the products of specific conditions which determined their formation and evolution processes. The existence of the Kuiper belt, suspected on theoretical bases since the 1940s, has been confirmed since 1992 with the observation of over 1200 trans-neptunian ob jects. Thanks to the the developments of more and more performing groundbased instrumentation and the use of large telescopes, these ob jects are now studies in a statistical way, both dynamically and physically, and these studies are precious for constraining the early formation models of the solar system.
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