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During the 20th century many theories addressed the issue , including the " planetesimal theory " of Thomas Chamberlin and Forest Moulton ( 1901 ) , the " tidal model " of James Jeans ( 1917 ) , the " accretion model " of Otto Schmidt ( 1944 ) , the " protoplanet theory " of William McCrea ( 1960 ) and finally the " capture theory " of Michael Woolfson .
 person: Thomas Chamberlin; person: Forest Moulton; person: James Jeans; person: Otto Schmidt; person: William McCrea; person: Michael Woolfson
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Thomas Chamberlin; person: Forest Moulton; person: James Jeans; person: Otto Schmidt; person: William McCrea; person: Michael Woolfson