| 单词 | planetary nebula |
| 例句 | When we look around us in our little corner of the Milky Way, we see many stars surrounded by spherical shells of glowing gas, the planetary nebulae. Cosmos 1980-01-01T00:00:00Z Every planetary nebula is a token of a star in extremis. Cosmos 1980-01-01T00:00:00Z Red giants find their outer atmospheres blowing away into space; planetary nebulae are the final stages of Sunlike stars blowing their tops. Cosmos 1980-01-01T00:00:00Z But, as night follows day, or as a planetary nebula becomes a white dwarf, it has its detractors. Brian Cox: Physics is better than rock'n'roll 2011-03-24T08:01:00Z Astronomers think that the structure is unique to ageing red-giant stars that will soon end to become planetary nebulae. A Rare Cosmic Magic Jug 2023-08-03T04:00:00Z The so-called "planetary nebulae" is a misnomer that dates back to the 18th century, when the astronomer William Herschel mistook their curved shapes for those of planets. James Webb telescope captures end stages of dying star's life 2023-08-03T04:00:00Z The colorful cloud in the image—somewhat misleadingly called a planetary nebula—is only a few thousand years old. Rare, Dust-Shrouded Dying Star Revealed in New JWST Image 2023-03-17T04:00:00Z Protostars are very young stars that are still growing in mass via its parent molecular cloud; such objects may have yet to absorb or expel the remaining gas and dust in their planetary nebulae. Tracing water's path through young solar systems hints at how alien life might form 2023-03-15T04:00:00Z Officially dubbed NGC 3132, a planetary nebula is created when a dying star expels large amounts of mass over a period of successive waves, such as those we see in these pictures. The 7 most spectacular images from the James Webb Space Telescope's first year 2022-12-26T05:00:00Z The name is derived from the fact that a few planetary nebulae, when viewed through a small telescope, have a round shape bearing a superficial resemblance to planets. Astronomy 2016-10-13T00:00:00Z The Ring Nebula is a well-known "planetary nebulae", found in the constellation Lyra, and is visible throughout the summer. James Webb telescope captures end stages of dying star's life 2023-08-03T04:00:00Z Two cameras aboard Webb captured the latest image of this planetary nebula, cataloged as NGC 3132, and known informally as the Southern Ring Nebula. James Webb Space Telescope reveals a range of beautiful images 2022-07-12T04:00:00Z Stars like the Sun form a planetary nebula, which comes from the collapse of the star’s outer layers in an event like the implosion of a building. An Introduction to Geology 2017-01-01T00:00:00Z This type of structure is called a "planetary nebula", but it actually has nothing to do with planets. James Webb: Nasa space telescope delivers spectacular pictures 2022-07-12T04:00:00Z There are tens of thousands of planetary nebulae in our own Galaxy, although many are hidden from view because their light is absorbed by interstellar dust. Astronomy 2016-10-13T00:00:00Z "We always knew planetary nebulae were pretty. What we see now is spectacular." James Webb telescope captures end stages of dying star's life 2023-08-03T04:00:00Z A planetary nebula is created when a dying star expels large amounts mass over a period of successive waves; in these pictures, we can see those waves. James Webb Space Telescope reveals a range of beautiful images 2022-07-12T04:00:00Z Their size is also dramatically different for two reasons: First, the original planetary nebula contained more gases and ices than metals and rocks. An Introduction to Geology 2017-01-01T00:00:00Z The Southern Ring, or “Eight-Burst” nebula, is a planetary nebula – an expanding cloud of gas, surrounding a dying star. NASA teases list of first celestial objects imaged by the James Webb Space Telescope 2022-07-08T04:00:00Z As Figure 22.18 shows, sometimes a planetary nebula appears to be a simple ring. Astronomy 2016-10-13T00:00:00Z Scientists think that one of them is collapsing andthat the second is interfering with the normal gas expulsion pattern, creating the symmetrical form of only 10 to 20 percent of planetary nebulae. Unrivaled View of Brilliant ‘Planetary Nebula’ NGC 2899 2021-01-15T05:00:00Z In the 1970s, theorists predicted that the molecule may exist today, most likely formed anew in planetary nebulae, clouds of gas ejected by dying sunlike stars. Astronomers have spotted the universe’s first molecule 2019-04-17T04:00:00Z Observations show that the central stars of planetary nebulae are more likely to be binary stars than was previously thought, giving further credence to this idea. An abundance of rare isotopes in a planetary nebula 2018-12-18T05:00:00Z Typically, stars inside a planetary nebula ionize gaseous material previously ejected — so the surrounding shell of material closest to the star’s surface is affected the most. A star that hides its shine draws admiring looks 2018-08-05T04:00:00Z Current research on planetary nebulae focuses on the reasons for having a torus around the star in the first place. Astronomy 2016-10-13T00:00:00Z Though the phenomenon is called a planetary nebula, the term is a misnomer. Unrivaled View of Brilliant ‘Planetary Nebula’ NGC 2899 2021-01-15T05:00:00Z Using a new computer model, they found that rather than simply fading away as previously thought, the dying sun will transform into a stunning planetary nebula visible for millions of light years around. Sun 'will flare into massive planetary nebula when it dies' 2018-05-07T04:00:00Z A planetary nebula is a glowing shell of gas and dust that is ejected from a Sun-like star during the final stages of the star’s evolution. An abundance of rare isotopes in a planetary nebula 2018-12-18T05:00:00Z That’s the Stingray Nebula, considered the youngest planetary nebula—a title given to nebulae born of a dying star—which became visible late last century. The Giant Squid Nebula and More Animals of the Cosmos 2018-03-20T04:00:00Z Planetary nebula shells usually expand at speeds of 20–30 km/s, and a typical planetary nebula has a diameter of about 1 light-year. Astronomy 2016-10-13T00:00:00Z A database of Cepheid distance moduli and tip of the red giant branch, globular cluster luminosity function, planetary nebula luminosity function, and surface brightness fluctuation data useful for distance determinations. A single population of red globular clusters around the massive compact galaxy NGC 1277 2018-03-11T05:00:00Z “The sun is right on the lower limit of being able to form a planetary nebula.” Sun 'will flare into massive planetary nebula when it dies' 2018-05-07T04:00:00Z Furthermore, theory2 predicts that the rarer isotopes are not made inside stars that become planetary nebulae. An abundance of rare isotopes in a planetary nebula 2018-12-18T05:00:00Z “It tells us, look: What shapes the planetary nebula is a binary system.” Dying gasps of paired stars sculpt galaxy’s colorful gas clouds 2016-09-16T04:00:00Z Given the number of such nebulae we nevertheless see, we must conclude that a large fraction of all stars evolve through the planetary nebula phase. Astronomy 2016-10-13T00:00:00Z This ghostly vision is a planetary nebula — the gently glowing remnants of a dying star. 365 days: The best science images of 2015 2015-12-16T05:00:00Z But by time this occurs, there’s already no Technetium left; it’s a signature we’ve never found in a single planetary nebula. A Periodic Table Surprise: The One Element In Stars That Isn't On Earth 2015-08-01T04:00:00Z What about direct observations of ageing Sun-like stars, as opposed to planetary nebulae? An abundance of rare isotopes in a planetary nebula 2018-12-18T05:00:00Z The planetary nebula is visible only through high-magnification telescopes, and it looks like a small pale ring. This Week's Night Sky: Ghostly Stellar Ring Revealed 2015-07-13T04:00:00Z Discuss what measurements you could make to determine whether you have discovered a planetary nebula or the remnant of a supernova explosion. Astronomy 2016-10-13T00:00:00Z L2 Puppis is in the process of forming its planetary nebula. What We Can Learn From the Beautiful Death of a Star 2015-06-10T04:00:00Z It’s the planetary nebulae nearest to Earth, extending 2.5 light-years across, making it larger than our entire solar system. Unforgettable Hubble Space Telescope Photos 2015-04-23T04:00:00Z That was the original purpose of the study: to explain the striking, irregular shapes formed by so-called "planetary nebulae". Doomed stars found at nebula's heart 2015-02-09T05:00:00Z The year in space: Over the past 12 months, scientists have captured stunning images of the planets, a galaxy, a planetary nebula and more from space. Mars rover finds mysterious jelly doughnut rock 2014-01-23T18:11:02Z Consider the following five kinds of objects: open cluster, giant molecular cloud, globular cluster, group of O and B stars, and planetary nebulae. Astronomy 2016-10-13T00:00:00Z Often the brightness and complexity of a planetary nebula hides its central star from view. How Hot Is the Hottest Star? [Excerpt] 2012-07-27T10:15:00.230Z 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? Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Eventually, those outer layers will waft away to form what's called a planetary nebula, while the core shrinks back into an object just like KOI 55. Dry-roasted planets: A Sun-Like Star That Tried To Eat Its Young 2011-12-29T09:00:00Z The white dwarf star at the center of this planetary nebula may be accompanied by a second-generation world, formed from the debris of the dying star's original planets. Earth's Ultimate Destruction—And Possible Reincarnation 2011-09-16T22:00:33Z About planetary nebulae, the last gasps of low-mass stars, and the future of our own Sun. Astronomy 2016-10-13T00:00:00Z The universe is capable of some pretty spectacular displays, but few things approach the cosmic grandeur of a planetary nebula. Planetary nebula dazzles astronomers 2011-07-29T09:00:00Z Sometimes a planetary nebula has a star at its center, and sometimes it appears hollow, like a smoke ring, and is then called a ring nebula. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Nebular chemistry was initiated by the same investigator when, on the 29th of August 1864, he observed the bright-line spectrum of a planetary nebula in Draco. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" A star has actually, under our eyes, become a planetary nebula, and the cycle of which he gave the first terms is complete. Sir William Herschel: His Life and Works Pictures of various planetary nebulae show a variety of shapes, but astronomers believe a majority of planetary nebulae have the same basic shape. Astronomy 2016-10-13T00:00:00Z Its visual appearance in the great telescope was now also that of a planetary nebula. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers No definite markings have as yet been seen upon Neptune, which body is described by several observers as resembling a faint planetary nebula. Astronomy of To-day A Popular Introduction in Non-Technical Language The suggestion which arises to our mind in view of the atomic and gravitating Aether is, that the planetary nebulae are exactly what their names imply, that is, nebulous matter around planets. Aether and Gravitation The not unfrequently considerable magnitude of their apparent diameter, and the remote distance from which they are revealed to us, show that both the planetary nebulae and the nebulous stars must be of enormous dimensions. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 How are planetary nebulae comparable to a fluorescent light bulb in your classroom? Astronomy 2016-10-13T00:00:00Z On the revival in the form of a planetary nebula, while the character of the spectrum had entirely changed, evidences of rapid motion in the line of sight remained. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers 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. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 The principal were, Saturn and the Annular Nebula of Lyra with the 3-feet; Saturn, a remarkable cluster of stars, and a remarkable planetary nebula, with the 6-feet. Autobiography of Sir George Biddell Airy Gravity eventually brings the nebular particles into closer aggregations, and increased collisions finally vaporize the entire mass, forming planetary nebulae and gaseous stars. A History of Science — Volume 3 These objects were given an extremely misleading name when first found in the eighteenth century: planetary nebulae. Astronomy 2016-10-13T00:00:00Z The planetary nebula 2102 is about 1' in diameter, pale blue in color, and worth looking at, because it is brighter than most objects of its class. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers The planetary nebula seem to be exceptional cases, but to this point we shall return later. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 The planetary nebula looked a mass of living and intensely brilliant light: this is an object which I do not suppose can be seen at all in our ordinary telescopes. Autobiography of Sir George Biddell Airy The mass loss will expose the hot inner core, which will appear at the center of a planetary nebula. Astronomy 2016-10-13T00:00:00Z The range of different shapes that we see among planetary nebulae may, in many cases, arise from the same geometric shape, but seen from a variety of viewing directions. Astronomy 2016-10-13T00:00:00Z Within a year the star had faded to less than the tenth magnitude, and its spectrum had completely changed in appearance, and had come to bear a close resemblance to that of a planetary nebula. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers Whether the Wolf-Rayet stars have in general been formed from planetary nebulae is a different question: some of them certainly have. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 This is fully seven times the average velocity of the helium stars, and the helium stars in general, therefore, could not have come from planetary nebulae. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 The velocities of the planetary nebulae seem to be an insuperable difficulty in the way of placing them between the irregular nebulae and the helium stars. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 Many astronomers think that planetary nebulae are among the most attractive and interesting objects we can see in the Galaxy. Astronomy 2016-10-13T00:00:00Z With our five-inch we see it simply as a planetary nebula. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers Whether any or all of the planetary nebulae that have been known since Herschel's day, and have remained apparently unchanged in form, have developed from new stars, is uncertain and doubtful. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 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. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 |
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