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 ?
Caption: Use an O III filter to search for the extremely faint, diffuse planetary nebula Abell 31; an Hbeta filter might also help.
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.
A planetary nebula arises when an aging star with about the mass of our Sun sheds its outer layers into space.
0) DOLIDZE 27 Open Cluster 16h36m5 -08 [degrees]56' NGC 6218-M12 Globular Cluster 16 47 2 -01 58 NGC 6240 Galaxy 16 53 0 +02 24 NGC 6254-M10 Globular Cluster 16 57 1 -04 06 NGC 6273-M19 Globular Cluster 17 02 6 -26 16 ESO 587-SC04 Open Cluster 17 04 4 -19 27 NGC 6284 Globular Cluster 17 04 5 -24 47 B 57 Dark Nebula 17 08 3 -22 50 NGC 6309 Planetary Nebula 17 14 1 -12 55 NGC 6333-M9 Globular Cluster 17 19 2 -18 31 B 78 Dark Nebula 17 21 1 -26 47 B 72 Dark Nebula 17 23 5 -23 38 BARNARD'S STAR Star 17 57 8 +04 44 Object Mag.
This image of Helix, the nearest planetary nebula to the sun, was taken by the Hubble Space Telescope.
In this report, we present photoelectric magnitude measurements of the planetary nebula NGC 6210.
The transition from red giant to planetary nebula - a gaseous envelope surrounding a "white dwarf" star that has collapsed in on itself - took only a few thousand years.
6 After a billion years, the red giant ejects its outer layer as a planetary nebula, leaving a collapsed core at the center.
Mystery in Monoceros "Located just %" southwest of 4th-magnitude Delta Monocerotis, the planetary nebula NGC 2346 is an easy target for amateur telescopes.
com/topic/planetary-nebula) planetary nebula ," a bright cloud of gas that, although it represents a dead star that has stopped performing nuclear fusion, could one day (https://www.
The Boomerang is a pre-planetary nebula, representing the stage in a star's life immediately preceding the planetary nebula phase, when the central star is not yet hot enough to emit sufficient ultraviolet radiation to produce the characteristic glow.
NGC 6210 is another bright and even smaller planetary nebula.