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• n  one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system

• Thus the planetesimal theory thought out by Chamberlin 30 years ago and elaborated with his Chicago University associate, Astronomer Forest Ray Moulton.
• His theory, the planetesimal, he ex pounded again in a new book published only last month The Two Solar Families the Sun's Children (University of Chicago Press, $2.
• Despite general acceptance of Chicago's late Thomas Chrowder Chamberlin's planetesimal theory of Earth's origin, Oxford's Herbert Hall Turner opined that science can never tell the .

News & Articles

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• Vega's hot dust from icy planetesimals scattered inward by an outward-migrating planetary system
  Vega has been shown to host multiple dust populations, including both hot exo-zodiacal dust at sub-AU radii and a cold debris disk extending beyond 100 AU. We use dynamical simulations to show how Vega's hot dust can be created by long-range gravitational scattering of planetesimals from its cold outer regions. Planetesimals are scattered progressively inward by a system of 5-7 planets from 30 ...
  March 28, 2014 - SpaceRef