planetary nebula

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planetary nebula

n.
A nebula, often circular or ring shaped, formed by the ejection of the outer layers from a late-stage, low-mass star.

planetary nebula

n
(Celestial Objects) an expanding shell of gas surrounding a dying star, formed from matter ejected from the star's outer layers; the gas is ionized by the remaining hot stellar core, emitting light in the process
[C18: named from its (occasional) resemblance to a planetary disc]

plan′etary neb′ula


n.
an expanding shell of thin ionized gas that is ejected from and surrounds a hot, dying star.
[1775–85]

plan·e·tar·y nebula

(plăn′ĭ-tĕr′ē)
A nebula consisting of an expanding shell of gas, mostly hydrogen, that surrounds a hot, compact central star. See more at star.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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 starplanetary 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
Translations
nebulosa planetaria
planetaarinen sumu
nébuleuse planétaire
References in periodicals archive ?
In doing so, they cast off their outer layers of dust and gas into space, creating a kaleidoscope of intricate patterns known as planetary nebulas.
The ghostly planetary nebulas were captured in infrared light by the Spitzer Space Telescope.
This designation, however, is deceiving because planetary nebulas actually have nothing to do with planets.
Planetary nebulas are the remains of stars, like the sun, that shed their outer layers of gas and dust as they age.
Kocur's computer-driven, eight-inch Newtonian telescope set up at the ball field behind Miller's River Environmental Center, those attending will get a chance to observe Saturn and its moons, bright stars, double stars, star clusters, the Orion Nebula, planetary nebulas, galaxies and other astronomical objects.
Tonight, we're looking at galaxies and planetary nebulas which are remains of supernovas,'' club historian Tom Koonce said at a recent gathering at Saddleback Butte State Park.
So named because astronomers a century ago thought their shape resembled that of planets, planetary nebulas have been studied since the 1890s.
Instead, planetary nebulas form when a star uses up all of the hydrogen in its core-an event our Sun will go through in about five billion years.
Another team used the Anglo-American Telescope in Coonabarabran, Australia, to observe planetary nebulas, or clouds of gas ejected from dying stars, in the Virgo and Fornax clusters.
Two astronomers now suggest that planetary nebulas may have an intimate connection with planets after all.
Moreover, the brightest planetary nebulas seem to have roughly the same intrinsic brightness in all kinds of galaxies.
Lutz of Washington State University in Pullman and her colleagues argue in the November PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC that the Southern Crab may represent a link between symbiotic starts and planetary nebulas -- astronomical entities usually put into separate categories.

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