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To form planetary systems, small solid particles which condense out of the cooling gas of the primitive solar nebula must aggregate together to form larger bodies. Centimeter-sized particles can grow out of micrometer-sized grains; planets can form from the coagulation of kilometer-sized planetesimals. The formation of stable, long-lived kilometer-sized objects from centimeter-sized particles is,...
A crucial step in the development of planetary systems is the aggregation of small solid particles to form planetesimals in gaseous protoplanetary disks such as the primordial solar nebula. Among small (centimeter-sized) aggregates for which self-gravity is negligible, a sticking mechanism is needed to hold the aggregate together, even when the relative velocities are very low. A similar cohesive...
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