This is a list of protoplanetary nebulae. These objects represent the final stage before a planetary nebula. During this stage, the red giant star begins to slowly expel its outermost layers of material. A protoplanetary nebula usually glows by reflecting the light from its parent star. This stage is usually brief, typically lasting no more than a few thousand years.
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This is a listofprotoplanetarynebulae. These objects represent the final stage before a planetary nebula. During this stage, the red giant star begins...
List of dark nebulaeListof diffuse nebulaeListof planetary nebulaeListofprotoplanetarynebulaeListof largest nebulae Lists of galaxies Listof galaxies...
for 'cloud, fog'; pl.: nebulae, nebulæ, or nebulas) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral, or molecular...
process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks and...
A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star...
remnant PG 1159 star (predegenerates) Protoplanetary nebula Supernova remnant White dwarf Listof planetary nebulae Osterbrock, Donald E.; Ferland, G. J...
in the constellation of Scorpius. It is considered to fall into an unusual category ofnebulae known as protoplanetarynebulae or post-AGB stars. A proto-planetary...
The presence of a conspicuous bipolar symmetry is usual in protoplanetary and planetary nebulae. Theorists, like Noam Soker, Vincent Icke [nl], Adam Frank...
Roberts — (protoplanetarynebulae) Roe — Edward Drake Roe, 1859–1929 (double stars) Roman-Lopes — (open star clusters, I.R.) Ross — Ross Catalogue of New Proper...
contains dark nebulae, emission nebulae, reflection nebulae, and H II regions. The presence of ripples on the surface of Orion's molecular clouds was discovered...
This is a listof circumstellar disks that have published resolved images. Many of them are protoplanetary disks or debris disks. Only some are transitional...
The Egg Nebula (also known as RAFGL 2688 and CRL 2688) is a bipolar protoplanetary nebula approximately 3,000 light-years away from Earth. Its peculiar...
formation of the star. Circumstellar envelopes of old stars (Mira variables and OH/IR stars) eventually evolve into protoplanetarynebulae, and circumstellar...
Most of the mass concentrated in the center, forming the Sun, and the rest of the mass flattened into a protoplanetary disk, out of which all of the current...
100 times higher than in Trapezium's Orion Nebula. Protoplanetary disks are present in both nebulae. Higher EUV fluxes make this an even more likely possibility...
of the nebula is primarily due to the emissions from doubly ionized oxygen. IRAS 19475+3119, protoplanetary nebula of Cygnus Listof largest nebulae "NAME...
consist of multiple bodies or even other objects with substructures. Examples of astronomical objects include planetary systems, star clusters, nebulae, and...
stars), or with evolved post-AGB stars (often in the form of bipolar nebulae). In the case of a young star, the bipolar outflow is driven by a dense, collimated...
and the presence of a protoplanetary disk, among others. Nearly all of the methods of determining age require knowledge of the mass of the star, which...
of Bright Nebulae, Lynds (1962) Catalogue of Dark Nebulae, van den Bergh (1966) Catalogue of Reflection Nebulae, Green (1988) Rev. Reference Cat. of Galactic...
Towards the end of their lives, many low-mass stars, like the Sun, slough off their outer layers to produce striking 'planetary' nebulae. But the hot star...
This is a listof stars arranged by their apparent magnitude – their brightness as observed from Earth. It includes all stars brighter than magnitude...
A proplyd, short for ionized protoplanetary disk, is an externally illuminated photoevaporating protoplanetary disk around a young star. Nearly 180 proplyds...
In astronomy, Bok globules are isolated and relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place...
publishing a "Listof IAU-approved Star Names" since 2016. As of April 2022, the list included a total of 451 proper names of stars. Of the roughly 10...
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