“A proportional condensation of the nebulous matter in the brighter places will sufficiently account for their different degree of shining.”

—  William Herschel

Astronomical Observations relating to the Construction of the Heavens... (1811)

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William Herschel 36
German-born British astronomer, technical expert, and compo… 1738–1822

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“Instead of inquiring after the nature of the cause of the condensation of nebulous matter, it would indeed be sufficient for the present purpose to call it merely a condensing principle; but since we are already acquainted with the centripetal force of attraction which gives a globular figure to planets, keeps them from flying out of their orbits in tangents, and makes one star revolve around another, why should we not look up to the universal gravitation of matter as the cause of every condensation, accumulation, compression, and concentration of the nebulous matter?”

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Astronomical Observations relating to the Construction of the Heavens... (1811)

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Astronomical Observations relating to the Construction of the Heavens... (1811)
Context: I compared also the present appearance of this nebula with the delineation which Huyghens has given of it in his Systema Saturnium... The changes that are thus proved to have already happened, prepare us for those that may be expected hereafter to take place, by the gradual condensation of the nebulous matter; for had we no where an instance of any alteration in the appearance of nebula, they might be looked upon as permanent celestial bodies, and the successive changes, to which by the action of an attracting principle they have been conceived to be subject, might be rejected as being unsupported by observation.<!-- p. 324

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