planetesimal hypothesis
noun Date: 1904 a hypothesis in astronomy: the planets have evolved by aggregation from planetesimals

New Collegiate Dictionary. 2001.

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  • planetesimal hypothesis — n. any of several theories postulating that the solar system originated with planetesimals * * * …   Universalium

  • planetesimal hypothesis — n. any of several theories postulating that the solar system originated with planetesimals …   English World dictionary

  • planetesimal hypothesis — noun (cosmology) the theory that the solar system was formed by the gravitational accumulation of planetesimals • Topics: ↑cosmology, ↑cosmogony, ↑cosmogeny • Hypernyms: ↑scientific theory * * * noun : a hypothesis in …   Useful english dictionary

  • Chamberlin–Moulton planetesimal hypothesis — The Chamberlin–Moulton planetesimal hypothesis was proposed in 1905 by geologist Thomas Chrowder Chamberlin and astronomer Forest Ray Moulton to describe the formation of the solar system. It was proposed as a replacement for the Laplacian… …   Wikipedia

  • planetesimal theory — planetesimal hypothesis or planetesimal theory, the hypothesis that minute bodies in space move in planetary orbits and gradually unite to form the planets of a given planetary system …   Useful english dictionary

  • planetesimal — /plan i tes euh meuhl/, Astron. n. 1. one of the small celestial bodies that, according to one theory (planetesimal hypothesis), were fused together to form the planets of the solar system. adj. 2. of or pertaining to a planetesimal or… …   Universalium

  • Planetesimal — Planetesimals are solid objects thought to exist in protoplanetary disks and in debris disks.A widely accepted theory of planet formation, the so called planetesimal hypothesis of Viktor Safronov, states that planets form out of dust grains that… …   Wikipedia

  • planetesimal — /plænəˈtɛsəməl/ (say planuh tesuhmuhl) adjective 1. of or relating to minute bodies in the solar system or in similar systems, which, according to the planetesimal hypothesis, move in planetary orbits and gradually unite to form the planets and… …   Australian English dictionary

  • planetesimal — n. any of a vast number of minute planets or planetary bodies. Phrases and idioms: planetesimal hypothesis the theory that planets were formed by the accretion of planetesimals in a cold state. Etymology: PLANET, after infinitesimal …   Useful english dictionary

  • accretionary hypothesis — noun : any explanation of the origin of the earth that involves the hypothesis of gradual growth by the gravitational infall of solid bodies (as asteroids, planetesimals, or meteorites) compare planetesimal hypothesis …   Useful english dictionary

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