The work was supported by NASA grant NAG5-4547.

IV Dust in the Outer Solar System and Other Planetary Systems

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Dust in young solar systems N.A. Krivova a b aMax-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany bAstronomical Institute, St. Petersburg University, 198504 St. Petersburg, Russia

Recent spectacular discoveries of extrasolar planets and circumstellar discs around main-sequence stars have offered a fertile ground for comparative studies of these objects and of the Solar System. There is no question that the planets and discs are manifestations of the same phenomenon called a 'solar system', even though the detection of planets around stars with discs is as yet hampered by observational limitations. In this review we concentrate on the main- and pre-main-sequence stars with circumstellar discs representing younger analogues of the Solar System. The emphasis is placed on the dust component of the discs. Properties of the dust, its spatial distribution and some physical processes in which it is involved are covered. Some general evolutionary tendencies are also touched upon.

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