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2RTr3y/2

This structure is very different from that formed by the dust grains in the nebula. The condensed dust/ice grains were initially only 1 ^m to 30 ^m across and the grains tended to settle on the disk (or ecliptic) plane as a result of the net gravitational field and gas drag. Settling increased as disk turbulence diminished and dust grains grew. The dust sheet was probably of the order of 10,000 km thick near the Sun, increasing slightly with distance (Jones, 2007).

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