During the 20th century many theories were proposed including the planetesimal theory of Thomas Chamberlin and Forest Moulton (1901), tidal model of Jeans (1917), accretion model of Otto Schmidt (1944), protoplanet theory of William McCrea (1960) and finally capture theory of Michael Woolfson.
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A major critique came during the 19th century from James Clerk Maxwell who maintained that different rotation between the inner and outer parts of a ring could not allow condensation of material.
Riemann hypothesis | Alvarez hypothesis | Witch-cult hypothesis | extraterrestrial hypothesis | two-source hypothesis | Rare Earth hypothesis | Hebrew Gospel hypothesis | Articulata hypothesis | Warburg hypothesis | Two-source hypothesis | Turnover-pulse hypothesis | Three-source hypothesis | Swoon hypothesis | Stolen body hypothesis | Statistical hypothesis testing | Schinzel's hypothesis H | Random walk hypothesis | Generalized Riemann Hypothesis | Four-document hypothesis | Extraterrestrial Hypothesis | Extraterrestrial hypothesis | Efficient-market hypothesis | Dopamine hypothesis of schizophrenia | Documentary Hypothesis | documentary hypothesis | Biophilia hypothesis | Augustinian hypothesis | Apparent-time hypothesis |