Pathways in the planetesimal formation in the minimum mass solar nebula model. The gray line shows the constant density evolutional track, which corresponds to the compact growth. The black, green, blue, and red lines are the evolutional track through dust coagulation via fluffy aggregates. Each line represents different mechanisms of dust coagulation, which are hit-and-stick, collisional compression, gas compression, and self-gravity compression. The red shaded region represents where the radial drift timescale is less than the growth timescale, which is equivalent to radial-drift region. The brown squares indicate the properties of comets, and the triangles represent their upper limit. The radii of dust aggregates for 1 μm, 1 cm, 1 m, 100 m, and 10 km are also written. Top left: for 5 AU in orbital radius. Top right: for 8 AU in orbital radius. The cross point represents where the dust falls onto the central star. Bottom left: for 5 AU in strong turbulence model where α_D = 10^-2. Bottom right: for 8 AU in two times as massive as MMSN model.