WordNet

(cosmology) the theory that the solar system was formed by the gravitational accumulation of planetesimals
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena; "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory (同)possibility, theory
a proposal intended to explain certain facts or observations
one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system

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Herwartz D1, Pack A2, Friedrichs B2, Bischoff A3.
Science (New York, N.Y.).Science.2014 Jun 6;344(6188):1146-50. doi: 10.1126/science.1251117.
The Moon was probably formed by a catastrophic collision of the proto-Earth with a planetesimal named Theia. Most numerical models of this collision imply a higher portion of Theia in the Moon than in Earth. Because of the isotope heterogeneity among solar system bodies, the isotopic composition of
PMID 24904162

Zahnle K1, Pollack JB, Kasting JF.
Geochimica et cosmochimica acta.Geochim Cosmochim Acta.1990;54:2577-86.
The distinctively fractionated Xe on Mars and Earth may have its root in a common source from which both planets accreted. We begin with Ozima and Nakazawa's hypothesis that terrestrial Xe fractionation was caused by gravitational separation of adsorbed solar nebular gases inside large porous plane
PMID 11537194

Brush SG.
Origins of life.Orig Life.1977 Apr;8(1):3-6.
T. C. Chamberlin suggested in 1897, on the basis of geological and climatological arguments, that the planets were formed by accretion of cold solid partices. With F. R. Moulton he developed convincing arguments against the Laplace nebular hypothesis and published a comprehensive 'planetesimal theor
PMID 331191