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As a result, the solar-prominence type, to which the earlier spectrum had seemed to conform, was completely effaced in the later. The cause of these alterations remains mysterious, yet its effects continue. The chromatic behaviour of the semi-extinct Nova, when scrutinised with great refractors, shows its waning light to be distinctly nebular.
To begin with, the position of the star was not exactly central. It lay sixteen seconds of arc to the south-west of the true nebular nucleus. Its appearance did not then signify a sudden advance of the nebula towards condensation, nor was it attended by any visible change in it save the transient effect of partial effacement through superior brightness.
As with the other Novae, when it first dashed into the nebula it was vaporised and gave a continuous spectrum with dark lines of hydrogen and helium. It showed no bright lines paired with the dark ones to indicate a train left behind; but in the end its own luminosity died out, and the nebular spectrum predominated.
On the lines of the generally received nebular hypothesis this can easily be imagined, in broad outline. The gases would form the outer shell of the forming planet, since the heavier particles would travel inward. In this mixed mass of gas the oxygen and hydrogen would combine, at a fitting temperature, and form water.
In a similar manner, the Copernican theory, the theory of gravitation, the nebular hypothesis, the theory of uniformity in geology, and every scientific advance has been opposed on the same grounds; that is, that these are against the teachings of the Christian Church.
This leads to the condensation of matter into suns and their planets, and the geological evolution of the earth, for example. Laplace's nebular hypothesis is an attempt to give an adequate statement of the cosmic phase of evolution. While this hypothesis has been much criticized of late, in its essentials it seems to stand.
Perhaps, confident, as he evidently is, that his view will finally be adopted, he may enjoy a sort of satisfaction in hearing it denounced as sheer atheism by the inconsiderate, and afterwards, when it takes its place with the nebular hypothesis and the like, see this judgment reversed, as we suppose it would be in such event. Whatever Mr.
A Settlement soon discovers that simple people are interested in large and vital subjects, and the Hull-House residents themselves at one time, with only partial success, undertook to give a series of lectures on the history of the world, beginning with the nebular hypothesis and reaching Chicago itself in the twenty-fifth lecture!
This so-called "nebular hypothesis" assumes that in the beginning all space was uniformly filled with cosmic matter in a state of nebular or "fire-mist" diffusion, "formless and void." It pictures the condensation coagulation, if you will of portions of this mass to form segregated masses, and the ultimate development out of these masses of the sidereal bodies that we see.
Should the Nebular Hypothesis ever be established, then it will become manifest that the Universe at large, like every organism, was once homogeneous; that as a whole, and in every detail, it has unceasingly advanced towards greater heterogeneity.
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