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...(September 1987), pp.255-269.</ref> He argued that gaseous clouds&mdash;[[nebulae]], which slowly rotate, gradually collapse and flatten due to [[gravity]] a ...to several times that of the Sun and are called protostellar (protosolar) nebulae.<ref name=Montmerle2006/> They possess diameters of 0.01&ndash;0.1&nbsp;pc ...