SP-345 Evolution of the Solar
System
FIGURE 12.9.1.-The growth of planetary
radii with respect to time. Runaway accretion occurs early for
Mercury, Venus, Earth, and Jupiter. The time of runaway accretion
approaches that of the duration of mass infall for Saturn, Mars, and
the Moon. (From Ip, 1974c.) For Uranus, Neptune, Pluto, and Triton,
runaway accretion occurs only after infall has ceased and the jet
stream has contracted due to negative diffusion; this growth is
schematically represented by the dashed curve.
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