On Some Photographs of the Great Nebula in Orion, taken by means of the Less Refrangible Rays in its Spectrum," Ap.
The heliogravure reproduction of the Trifid nebula is No.
At the time the photogravures were ordered no large scale photograph of the Trifid nebula had, so far as I am aware, ever been published.
I say that it will become again the nebula out of which it was formed, and by friction with other nebula re-form into a fresh shape and so on ad infinitum--but I can't explain why.
The accompanying cut, which exaggerates the brightness of the nebulaas compared with the star, gives but a faint idea of this most singular object.
You will recall the winding streams in the Great Nebula of Orion.
The middle star in the Sword is theta, and is surrounded by the celebrated Nebulaof Orion.
Barnard has made a beautiful photograph showing M 8 and the trifid nebula on the same plate, and he remarks that the former is a far more remarkable object than its more famous neighbor.
It contains a few objects worthy of attention, the first being the nebula 4532, the "dumb-bell nebula" of Lord Rosse.
The nebula 3572, although we can see it only as a pair of misty specks, is in reality a very wonderful object.
Although the nebula 3572 is a very wonderful object, we shall leave it for another evening.
The nebula 2343 presents itself to us in the form of a faint, hazy star, but with large telescopes its appearance is very singular.
One can hardly help concluding that this must have been the way in which the dumb-bell nebula near star 14 Vulpeculae was formed.
Seem to point to differences in the mass of matter abandoned by the nebula at different periods.
Here our operations put us in mind that we have said nothing yet about the ether, or what effect it might have on our nebula and the bodies formed out of it.
Evolution throughout has been one and continuous, from nebula to sun, from gas-cloud to planet, from early jelly-speck to man or elephant.
It is even suggested that the spiral nebula originated by disruption of one star by a swift-moving passing star.
Diagram showing the origin and character of a spiral nebula according to the planetesimal hypothesis of the origin of the solar system.
The most prominent nebula of this class is situated in the constellation Ursa Major, and is called the Owl Nebula, from its fancied resemblance to the face of that bird.
The Orion Nebulasuggests the opened jaws of a fish or sea monster, hence called the Fish-Mouth Nebula.
Adjacent to this nebula is another of the same class with a double nucleus, and associated with it is a nebulous star.
In Ursa Major there is an ovalnebula resembling that of Andromeda, but on a much smaller scale.
Though great telescopes have been able to render visible thousands of stars over and around it, yet the nebula itself is irresolvable and bears no trace of stellar formation; neither, according to Dr.
The nature of those stars is involved in considerable obscurity, and one class of nebula would seem to merge into the other; nebulous stars with faint aureolæ do not differ much from small nebulæ interspersed with stellar points.
Another interesting planetary nebula is in the constellation of the Dragon, near to the pole of the ecliptic; it is slightly oval, of a pale blue colour, and contains a star of the eleventh magnitude in its centre.
A nebulaof this class was discovered by Sir John Herschel in the Centaur.
Another large bright nebula (called 30 Doradus), also in the Southern Hemisphere, is composed of a series of loops with intricate windings forming a kind of open network against the background of the sky which it adorns.
The largest and most remarkable of all the nebulæ is that known as the Great Nebula in Orion, which was discovered and delineated by Huygens in the middle of the seventeenth century.
The rifts, or canals, in the Great Nebula in Andromeda is a case in point, but two better illustrations may be taken from the planets.
Burnham finds that the four brighter stars in the trapezium in the great Orion nebula (in the "sword") are relatively fixed (Cat.
As this appears an incredibly large mass to be compressed into a volume even so large as that of our sidereal system, we seem compelled to reject the hypothesis that the nebula represents an external universe.
With reference to the small star which suddenly blazed out near the nucleus of the Andromeda nebula in August, 1885, Prof.
Assuming that the nebulahas the same diameter as the Milky Way, or about 6000 "light years," as estimated by Prof.
A great photographic nebula in Orion was discovered by Prof.
As the Andromeda nebula shines only as a star of about the 5th magnitude the hypothesis of an external universe seems to be untenable.
On the other hand, the evolution of the solar system from a rotating spiral nebula seems very probable.
The appearance of this temporary star in the Andromeda nebula seems to afford further evidence against the hypothesis of the nebula being an external universe.
The nebula is decidedly attached to the stars, and is as decidedly not stellar.
On this view of the matter we may suppose that the component particles are small bodies widely separated, and in this way the mean density of the Andromeda nebula may be very small indeed.
Here, then, is the means of determining whether the light emitted by a given nebula comes from an incandescent gas, or from a congeries of ignited solids, stars, or suns.
In 1864, Mr. Huggins made this examination in the case of a nebula in the constellation Draco.
If its spectrum be discontinuous, it is a true nebula or gas; if continuous, a congeries of stars.
He counted no fewer than forty in the cluster called the Pleiades, or Seven Stars; and he has given us drawings of this constellation, as well as of the belt and sword of Orion, and of the nebula of Præsepe.
In the great nebula of the Milky Way, he descried crowds of minute stars; and he concluded that this singular portion of the heavens derived its whiteness from still smaller stars, which his telescope was unable to separate.
All the properties and laws of the nebula require to be accounted for.
By mutual gravitation, therefore, all the substance of the nebula must have begun to concentrate upon itself, or to condense.
That is to say, the condensation of the nebula as a whole of necessity implies at least the origination of these new material and dynamical relations among its constituent parts.
The origin of the nebula thus presents itself to reason as a problem which demands solution no less than the origin of the planets.
Now, bearing this caveat in mind, we have next to observe that when once the nebula began to condense, new relations among its constituent parts would, for this reason, begin to be established.
Here is to be seen at work that powerful telescope which enabled Bond to resolve the nebula of Andromeda, and Clarke to discover the satellite of Sirius.
Sabine floated on with a perfect nebula of gentlemen around her.
Again the nebula followed her, but Fink was no longer at her side.
Being whose shortest moments are too vast to be noted by the awful nebula of the Hour Glass, although its rushing sands are systems of worlds.
In nebula separated from nebula by trillions of leagues, plane beyond plane, they stretch and glitter to the feet of God.
There are many thousands of such nebula visible, some of them capable of packing away in their awful bosoms hundreds of thousands of our galaxies.
We then see an exquisite nebulaagainst whose opalescent tapestry the tiny animals gleam like twinkling orange stars.
But the living nebula is not composed of fixed stars; on the contrary, its specks are in continual movement.
The planetesimal hypothesis, advanced in recent years by Professor Moulton and Professor Chamberlin, contends that the nebula is a vast cloud of liquid or solid (but not gaseous) particles.
We must, therefore, see what the nebula is, and how it develops.
Laplace therefore took the nebula as his starting-point.
If there were any large region in the arm of the nebula which had no single massive nucleus, the cosmic dust would gather about a number of smaller centres.
If we accept this theory, the origin of the spiral nebula becomes intelligible.
Ball further works out the principles on which the particles of the condensing nebula would tend to form a disk rotating on its central axis.
In any case, we have here a good suggestion of the origin of the spiral nebula and of its further development.
As they are flat or disk-shaped, we see this structure plainly when they turn full face toward the earth, as does the magnificent nebula in Canes Venatici.
The same structure can be traced in the mighty nebula in Andromeda, which is visible to the naked eye, and it is said that more than half the nebulae in the heavens are spiral.
The humming, revolving nebula had condensed, and hung, a new world, in the firmament of apple-green shade.
If this were so, the dimensions of the Orion nebula would be indeed enormous, far larger probably than those of the whole system whereof our sun is a member.
This nebula has been subjected to spectrum-analysis by Mr. Huggins.
And therefore astronomers were not a little surprised when it was proved by Mr. Huggins' spectrum-analysis that the nebula consists of gaseous matter.
The star [iota] (double as shown in Plate 3) below the nebula is involved in a strong nebulosity.
The nebula is shown in Plate 3 as I have seen it with a 3-inch aperture.
Within the limit of that sphere He sets up a kind of gigantic vortex--a motion which sweeps together all the bubbles into a vast central mass, the material of the nebula that is to be.
As ages rolled on the condensation increased, and presently the stage of a vast glowing nebula was reached.
The great nebulain Orion is one of the most noticeable objects in the heavens.
Huggins has found that the spectrum of this nebula is not gaseous.
It has been estimated by Huggins that the light received from a nebula will not exceed the light of a sperm candle looked at from a distance of a quarter of a mile.
Another annular nebula is that situated to the south-west of Lambda Scorpii.
This large nebula is situated in that part of Orion which is occupied by several stars known as the Sword Handle.
Around these multiple stars is to be seen the nebula, as though the multiple stars really were enveloped by the nebulaextending for a great distance out into space.
One of these clusters is the cluster in Hercules, while another is the great nebula of Orion.
It is thought by some astronomers that the light received from a nebula is indicative of the stage of development to which it has arrived.
One of the outlying spirals of the nebula has struck the earth," he said.
It's not likely that the gap between this spiral and the nucleus of the nebula is more than thirty million miles across, at the most; so you see we'll probably be in the nucleus within a month, and possibly much less than a month.
Th' Nebula is a direful bird 'S he skims the ether blue!
The president of the Royal Astronomical Society of Great Britain proved to the satisfaction of most of his colleagues that a nebula could not possibly contain enough water to drown an asteroid, let alone the earth.
We're within three hundred million miles of the watery nebula now, and you know that the earth travels more than that distance in twelve months.
I regard that ring as symbolical of a nebulaenveloping the earth, and I think that the second deluge, which we have lived to see, was foretold here thousands of years ago.
I did not think that the sea had anywhere attained so great an elevation before the nebula condensed.
He was pointing at the Lord Rosse Nebula on the wall).
No such thing as a watery nebula has ever been known to science.
The principal representation was that of a world overwhelmed with a flood, and of a nebula descending upon it.
Can the law connecting speed of motion and spectral type be so general that the planetary nebula is to be regarded as the final evolutionary stage?
A recent investigator of the distribution of luminosity in the great nebula of Orion finds that radiations from nebulium are confined chiefly to the Huygenian region of the nebula and its immediate neighborhood.
Simon Mayer has left us the first drawing of a nebula, the Orion nebula as he saw it in 1612.
Because we have actually seen one star turn into a nebula we should not jump to the conclusion that all nebulae are formed from stars, even if this might seem a direct inference from the high radial velocities of planetary nebulae.
The number of large spiral nebulae is not very great; the largest of all is the great nebula of Andromeda, whose length stretches over an arc of seven times the breadth of the moon, and its width about half as great.
The Orion nebula is receding from the earth about eleven miles in every second.
Perhaps a dark ring of absorptive or occulting matter encircles the nebula in nearly the same plane with the luminous whorls.
This nebula is a naked-eye object near Eta Andromedae, and it is often mistaken for a comet.
Differences of instruments, of plates, of exposure, and development--all have occasioned differences in portrayal of a nebula which do not exist.
As was to be expected, the nebula does not rotate as a rigid body, but the nearer the center the greater the angular velocity, and Van Maanen finds evidence of motion along the arms and away from the center.
And such prodigious heat is generated by the collision that the nebula is once more raised to incandescence, and the old drama begins again.
They were all cast off as rings of nebula at the equator of the rotating solar mass, and gradually condensed into independent bodies.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nebula" in a variety of sentences. We hope that you will now be able to make sentences using this word.
