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Figure 1: A top view of the solar nebula illustrating the various regions of the viscosity. Inner region: MRI (magnetorotational instability) survives due to the thermal ionization. High viscosity, high radial inflow velocity, and short inflow time. Intermediate region: MRI is suppressed. Low viscosity, low inflow velocity, and long inflow time. Outer region: MRI survives due to the ionization by cosmic rays. High viscosity, high inflow velocity, and short inflow time. The material tends to accumulate in the Jupiter-Saturn region due to the difference of the inflow velocity between the intermediate and outer regions. The gas inflow time in Jupiter-Saturn region is long enough that they have time to capture the gas.

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