Two Approaches to Discuss on the Unexpected Activity of Comets at Large Heliocentric Distances H.
3-D Modelling of the Surface Activity of a Comet Nucleus S. Organic Solids in the Outer Solar System: Kuiper Belt Planetesimals D.P. The Link Between Cometary and Interstellar Dust M. Comets as Samplers of Interstellar Dust J.M. Cometary Dust Loss: Meteoroid Streams and the Inner Solar System Dust Cloud D.W. Area to Mass Ratio and Packing Factor from Meteor Data B.Å.S. A Circumsolar Dust Ring Near the Earth S. On the Origin of Complex Interstellar Molecules S.B. Laboratory Investigations of Hydrogen Recombination Reactions on Interstellar Dust Grain Analogues J. Post Flight Analyses of Impact Sites on Eureca Spacecraft and Solar Cell Arrays H. Pulse-Heating of Fragments from Orgueil (CI): Simulation of Atmospheric Entry Heating of Micrometeorites A. Improvement of the Discrete Dipole Approximation for the Scattering Calculations of Clusters: The A1-Term Method H. Properties of Interstellar Grains Derived from X-ray Halos J.W. Modeling Astrophysical Phenomena Involving Dust C.M. Extinction and Infrared Emission From Fractal Dust Grains M.E. Dust Properties and Distribution in the UV B. The TAUVEX UV Imager and Its Contribution to the Study of Dust N. Statistical Properties of the Interstellar Dust in Faint Early-Type Galaxies I. Dust in Herbig Ae/Be Stars and the Cosmic Dust Connection M.L. Optical Data of Glassy Pyroxenes and Olivines H. Some Astrophysical Applications of Ion Irradiation Experiments G.A. Determination of the Optical Constants of Ices in the Mid Infrared F. Observations of CO Ices in Molecular Clouds J.E. Polarization of Starlight by Interstellar Dust D.C.B. Infrared Spectroscopy of Interstellar Ices D.C.B.
Implications for the Ultraviolet-Visible Interstellar Extinction F. Neutral and Ionized PAH Spectral Properties. Organic Material in the Interstellar Medium Y. The Core-Mantle Interstellar Dust Model J.M. Formation and Evolution of Interstellar Icy Grain Mantles W.A. But this is a continuing story: what happens to the solid particles in space after they emerge from stellar sources has important scientific consequences since it ultimately bears on our own origins - the origins of solar systems and, especially, of our own earth and life in the universe. The properties of interstellar dust provide possible keys to its origin in comets and asteroids and its ultimate origin in the early solar system. In our own solar system, studies of meteorites, comets and comet dust reveal many features that follow directly from the interstellar dust from which they formed. The most recent observational, laboratory and theoretical methods are examined in detail. Solid particles are followed from their creation through their evolution in the Galaxy to their participation in the formation of solar systems like our own, these being now clearly deduced from observations by the Hubble Space Telescope as well as by IR and visual observations of protostellar disks, like that of the famous Beta Pictoris object.
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