Untitledof the wreckage of some earlier organisation than of the parentage ofour planetary system." Several other theories have been propounded toaccount for the origin of the earth, but the one that has found mostfavour in the eyes of authorities is that of Chamberlin and Moulton.According to this theory a great nebular mass condensed to form the sun,from which under the attraction of passing stars planet after planet,the earth included, was heaved off in the form of knotted spiral nebulæ,like many of those now observed in the heavens.Of great importance were the "knots," for they served as collectingcentres drawing flying matter into their clutches. Whatever part of theprimitive bolt escaped and scattered was drawn out into independentorbits round the sun, forming the "planetesimals" which behave likeminute planets. These planetesimals formed the food on which the knotssubsequently fed.The Growth of the EarthIt has been calculated that the newborn earth--the "earth-knot" ofChamberlin's theory--had a diameter of about 5,500 miles. But it grew
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