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What is a planetary nebula? | Cool Cosmos

A planetary nebula is created when a star blows off its outer layers after it has run out of fuel to burn. These outer layers of gas expand into space, forming a nebula which is often the shape of a ring or bubble. About 200 years ago, William Herschel called these spherical clouds planetary nebulae because they were round like the planets.What Is a Nebula? | NASA Space Place NASA Science for KidsApr 08, 2021 · A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. Videos of planetary nebula Watch video on videohive.netGalaxy Background Nebulavideohive.netSee more videos of planetary nebula

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list of nebulaenebula facts for kidshow are planetary nebulae formedred giant to planetary nebulawhat causes different colors in planetary nebulaeabell planetary nebulacenter of a planetary nebulahow do planetary nebulae formSome results are removed in response to a notice of local law requirement. For more information, please see here.Planetary nebula | astronomy | BritannicaPlanetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars. Observed telescopically, they have a relatively round compact appearance rather than the chaotic patchy shapes of other nebulaehence their name, which was given because of their resemblance to planetary disks when viewed with the instruments of the late 1700s, when the Planetary nebula | SpaceEngine Wiki | FandomPlanetary nebulae are the most common type of nebula in most galaxies. They are expanding shells around young white dwarfs, the remains of intermediate-mass stars in which nuclear fusion has ceased. The smallest of the three types of nebulae, with most having a diameter of only around 0.01 parsecs, planetary nebulae can be found in all types of galaxies, usually being the dominant type of planetary nebula

Planetary nebula | Space Wiki | Fandom

Planetary Nebula. A planetary nebula is an emission nebula consisting of an expanding glowing shell of ionized gas ejected during the asymptotic giant branch phase of certain types of star late in their life. [The term for this class of objects is a partial misnomer that originated (1784 or 1785) with astronomer William Herschel, because when viewed through his telescope, these objects planetary nebulaPlanetary nebula | Definition of Planetary nebula at planetary nebulaplanetary nebula [ pln -tr ] A nebula consisting of a rapidly expanding shell of glowing gas, mostly hydrogen, ejected from a red giant upon its collapse into a white dwarf. Ultraviolet radiation from the hot, luminous white dwarf ionizes the expanding gas and causes it to glow.Planetary nebula - definition of planetary nebula by The planetary nebulaNoun 1. planetary nebula - a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star nebula - an immense cloud of gas (mainly hydrogen) and dust in interstellar space

Planetary nebula - Simple English Wikipedia, the free planetary nebula

A planetary nebula is a nebula that is made up of gas and plasma. They are made by certain types of stars later in their life. They look like planets through small optical telescopes. They do not last for long compared to a star, only tens of thousands of years.Planetary nebula - ScienceDailyJan 22, 2019 · A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their livesPlanetary nebula - Chemical composition | BritannicaPlanetary nebulae are chemically enriched in elements produced by nuclear processing within the central star. Some are carbon -rich, with twice as much carbon as oxygen, while there is more oxygen than carbon in the Sun. Others are overabundant in nitrogen; the most luminous ones, observed in external galaxies, are conspicuous examples.

Planetary Nebulae

Planetary nebulae, some of the loveliest objects in the sky, are complex shells of gas that have been ejected by dying advanced giant stars like Mira.They were discovered as a set and given their collective name by William Herschel in the late 1700s. The story is given in the text for the "first planetary," NGC 7009.See the table that follows this introduction.Planetary Nebulae and White Dwarfs | Astronomy 801 planetary nebulaThe duration of the planetary nebula stage for stars can be estimated quite simply in the following way: From spectroscopy, the expansion velocities of planetary nebulae are estimated to be approximately 20 - 30 km/sec. We can use the standard right triangle technique to determine the physical size planetary nebulaPlanetary Nebulae - Williams CollegeA planetary nebula is a beautiful object created during the final stages of the life of a star whose birth mass was between 1 and 8 solar masses.

Planetary Nebulae - SEDS Messier Database

Planetary Nebulae are typically small, faint nebulae, found between the stars as comparatively rare objects. Once thought to be strange, odd objects, evidence has been found that the vast majority of stars will produce such an object when they are evolving from their late Red Giant state to their final White Dwarf state, and their rareness is just due to the short lifetime of this state of planetary nebulaPlanetary Nebula: Gas and Dust | SpaceMay 09, 2016 · Planetary nebulae are the cloudy remnants of smaller stars that have shed their outer layers of gas, but haven't exploded into supernovas.Planetary Nebula | National Schools' ObservatoryA planetary nebula is an expanding, glowing shell of hot gas (plasma) that is cast off towards the end of a low- mass star's life. Despite the name, they have nothing to do with planets, and were so named because early astronomers thought they looked a bit like planets through a small telescope.

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