In August, 1901, an enveloping nebula was discovered, and a month later certain wisps of this nebulosity appeared to have moved bodily, at a speed seventy-fold greater than ever previously observed in the stellar universe.
Optically it was always a puzzle, but photographs by Roberts of England first revealed the true spiral, with ringlike formations partially distinct, and knots of condensing nebulosity as of companion stars in the making.
He writes: "We shall conclude this chapter by the mention of two phenomena, which to me indicate the existence of some slight degree of nebulosity about the sun itself, and even to place it in the list of nebulous stars.
Conversely, if every star possesses an electro-magnetic aetherial field, as they undoubtedly do, then it seems only reasonable to infer that that electro-magnetic field possesses a nebulosity which corresponds with our zodiacal light.
Barnard adds that the nebulosity is easily visible in a 12-inch telescope.
For if there is an intimate relation between the stars and the nebulosity, it would follow that where there is no nebulosity in this particular region there would be no stars.
A close examination of these photographs has given the present writer the impression that the dark lanes and spots are in the nebulosity, and that the nebulosity is mixed up with the stars.
Repeating the photographs at intervals, it was found that this nebulosity was rapidly changing in shape.
When, with its giant reflecting telescope, photographs were taken of the region of Nova Persei after it had become comparatively faint, it was found that there was an extraordinarily faint nebulosity surrounding the star.
Then again we have numerous ring-formed nebulae, usually with a star involved in dense nebulosity in the centre, separated by a dark space of various widths from the outer ring.
The wide extent and great diffuseness of this bright-line nebulosity over a large part of the constellation of Orion might be regarded, perhaps, as pointing in this direction.
It is the nebulosity out of which the whole came and into which all is ultimately occluded.
Our judgment, I may venture to say, will be, that the nebulosity about the star is not of a starry nature.
There was no connecting nebulosity between these objects, the tails of the two smaller not reaching each other, or the large comet.
We can no more expect, then, to observe the primary processes of Creation; and to these primary processes the condition of nebulosity has already been explained to belong.
Moreover, those who maintain the existence of nebulae, do not refer the nebulosity to extreme distance; they declare it a real and not merely a perspective nebulosity.
Laplace assumed his nebulosity heterogeneous, merely that he might be thus enabled to account for the breaking up of the rings; for had the nebulosity been homogeneous, they would not have broken.
Sir William Herschel, by his observation of those objects, arrived at the conclusion 'that there exists in space a shining fluid of a nature totally unknown to us, and that the nebulosity about those stars was not of a starry nature.
The 'glow' which surrounds them has been observed in a few instances to have vanished without leaving any trace of nebulosity behind, but the causes which have brought about such a result are entirely unknown.
Nebulæ can be selected so that an insensible gradation shall take place from a coarse cluster like the Pleiades down to a milky nebulosity like that in Orion, every intermediate step being represented.
The nebulosity of the ten-foot can be resolved into stars by the twenty-foot, and so on.
As an explanation of the general climatic conditions of the past, however, Shapley points out that the hypothesis has the objection of being vague, and that nebulosity should not be regarded as more than "a possible factor.
Probably throughout all our part of space such nebulosity exists (it is all around us, we are sure), but only in certain regions is it dense enough to affect conspicuously the stars involved in it.
Another objection is that there is no knownnebulosity near at hand with which to connect the climatic vicissitudes of the last glacial period.
That proposition is, that the whole world, living and not living, is the result of the mutual interaction, according to definite laws, of the forces possessed by the molecules of which the primitive nebulosity of the universe was composed.
By going back as far as possible, we thus arrive at a nebulosity so diffused that its existence could hardly be suspected.
The nebulosity connected more or less closely with the brighter Pleiades stars may be a case in illustration.
Wright has observed the absorption lines of helium and hydrogen in the spectra of the nuclei of some planetary nebulae, although the helium and hydrogen lines are bright in the nebulosity surrounding the nuclei.
A time came, according to Laplace, when the nebula was rotating so rapidly that an outer ring of nebulosity was in equilibrium under centrifugal and gravitational forces and refused to be drawn closer in toward the center.
Apparently, the region was full f nebulosity which is normally invisible to us.
Ritchey's photograph of September showed extensive areas of nebulosity around the star.
Going back to a March 29th photograph taken for a different purpose, Perrine found an irregular ring ofnebulosity closely surrounding the star.
Wright has recently shown that the stellar nuclei of planetary nebulae are Wolf-Rayet stars, and he has formulated several steps in the process whereby the nebulosity in a planetary eventually condenses into the central star.
The chances are strong that the star has rushed through the nebulosity with high rate of speed and that the resulting bombardment of the star has expanded and intensely heated its atmosphere.
Inasmuch as the nebulosity in the rings was not uniformly distributed, each ring broke into pieces, and the pieces of each ring, in the progress of time, condensed into a gaseous mass.
There is first the more brilliant central point, or nucleus, surrounded by a nebulosity called the hair, or brush, and prolonged in a luminous appendix stretching out into the tail.
To left and to right, as far as the eye could see, they stretched--and they vanished in the auroral nebulosity on high!
Its temperature gradually diminished, and, becoming contracted by cooling, the rotation increased in rapidity, and zones ofnebulosity were successively thrown off, in consequence of the centrifugal force overpowering the central attraction.
From what we have already advanced concerning the coma or nebulosity of the comet, we pass by an easy path to an explanation of the tail.
Now, if we make the calculation, we shall find that the diameter of the nebulosity of a comet is inversely as the force of the radial stream.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nebulosity" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: haziness; nebula; overcast
