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Models of planetesimal disks suggest that low relative velocities between the bodies produce accretion (objects hit and stay together) rather than fragmentation (objects break up and disperse).
After all, planetesimal sized portions of the Solar System cannot be considered to be orbiting the Earth, except in the obvious case of the Moon.
His greatest contribution, however, was his planetesimal hypothesis of the origin of the planets.
Like the hills and valleys on a contour map the gravity wells of suns, planets, moons, and planetesimals showed up.
When the planets formed 4.6 billion years ago, they formed from an agglomeration of many planetesimals , or small solid celestial bodies.
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