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I report a novel theory that nonuniform viscous frictional force in the solarnebula accounts for the largest mass of Jupiter and Saturn and their largestamount of H and He among the planets, two outstanding facts that are unsolvedpuzzles in our understanding of origin of the Solar System. It is shown thatthe nebula model of uniform viscosity does not match the present planet masses.By studying current known viscosity mechanisms, I show that viscosity is moreefficient in the inner region inside Mercury and the outer region outsideJupiter-Saturn than the intermediate region. The more efficient viscositydrives faster radial inflow of material during the nebula evolution. Becausethe inflow in the outer region is faster than the intermediate region, thematerial tends to accumulate in Jupiter-Saturn region which is between theouter and intermediate region. It is demonstrated that the gas trapping time ofJovian planets is longer than the inflow time in the outer region. Thereforethe gas already flows to Jupiter-Saturn region before Uranus and Neptune cancapture significant gas. But the inflow in the Jupiter-Saturn region is so slowthat they can capture large amount of gas before the gas can flow furtherinward. Hence they have larger masses with larger H and He content than Uranusand Neptune. I also extend the discussion to the masses of the terrestrialplanets, especially low mass of Mercury. The advantages of this theory arediscussed.

Nonuniform viscosity in the solar nebula and large masses of Jupiter and Saturn