Titlebook: Origin and Early Evolution of Comet Nuclei; Workshop honouring J H. Balsiger,K. Altwegg,R. Schulz Book 2008 Springer-Verlag New York 2008 P

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Origin of Comet Nuclei and Dynamics,at would have been greatly favored if the solar system formed in a dense galactic environment. The trans-neptunian object Sedna might be the first discovered member that belongs to such a core. The trans-neptunian population is the main source of Jupiter family comets, and may be responsible for a l

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Cometary Refractory Grains: Interstellar and Nebular Sources,xygen and contributing to the canonical low oxygen fugacity. Alternatively, the influx of water vapor and/or oxygen rich dust grains from outer (cooler) disk regions can raise the oxygen fugacity. Low oxygen fugacity of the canonical solar nebula favors the condensation of Mg-rich crystalline silica

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,How Well Do Experimental Results on Large Samples of?Gas-Laden Amorphous Ice Duplicate Deep Impact’, the 135?K front did not penetrate deeper than a few meters. Altogether, the agreement between the findings of Deep Impact and our experimental results point to a loose agglomerate of ice grains (with a silicate-organic core), which was formed by a very gentle aggregation of the ice grains, without

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