Excerpt from Problems of Cosmogony and Stellar Dynamics
The present essay is primarily an attempt to follow up a line of research initiated by Laplace and Maclaurin, and extended in various directions by Roche, Lord Kelvin, Jacobi, Poincare and Sir G. Darwin. Within two years of the close of his life, Darwin remarked that the way to further progress in cosmogony was blocked by our ignorance of the figures of equilibrium of rotating gaseous masses. He wrote as follows (Darwin and Modem Science, p. 563, and Tides, 3rd edition, p. 401):
"As we have seen, the study of the forms of equilibrium of rotating liquids is almost complete, and a good beginning has been made in the investigation of the equilibrium of gaseous stars, but much more remains to be discovered.
"As a beginning we should like to know how a moderate degree of comprehensibility would alter the results for liquid, and... to understand more as to the manner in which rotation affects the equilibrium and stability of rotating gas. The field for the mathematician is a wide one, and in proportion as the very arduous exploration of that field is attained, so will our knowledge of the processes of cosmical evolution increase...
" Human life is too short to permit us to watch the leisurely procedure of cosmical evolution, but the celestial museum contains so many exhibits that it may become possible, by the aid of theory, to piece together bit by bit the processes through which stars pass in the course of their evolution." Guided possibly by considerations such as these, the Adjudicators of the Adams Prize announced as the subject for the 1917 Essay:
The course of evolution of the configurations possible for a rotating and gravitating fluid mass, including the discussion of the stabilities of the various forms.
At this time I had for some years been engaged in an attack on this problem. The announcement offered an excuse not only for putting together my own results in essay form but also for welding them on to the earlier results obtained in the classical papers of Darwin, Poincare and other workers at this problem. After the adjudication of the prize, the essay was enlarged by the addition of some farther results which had been obtained in the interval, and the present volume is the result.
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