Dark Nebula
Dark nebulae are interstellar clouds that contain a very high concentration of dust. This allows them to scatter and absorb all incident optical light, making them completely opaque at visible wavelengths.
Dark nebula
Arguably the most famous dark nebula, the Horsehead Nebula.
A dark nebula is a large molecular cloud which appears as a star-poor region where the dust of interstellar medium seems to be concentrated.
Dark Nebula:
The dark nebulae are clumps or clouds that become opaque because of their internal dust grains.
Dark nebula
Wikipedia, the free encyclopedia - Cite This Source
A dark nebula is a type of interstellar cloud that is so dense that it obscures the light from the background emission or reflection nebula (e.g., the Horsehead Nebula) or that it ...
dark nebula
declination
the angular distance of a celestial object above or below the celestial equator; the celestial sphere equivalent of latitude ...
Dark Nebula
A relatively dense (up to 104 particles per cm3) cloud of interstellar matter whose dust particles obscure the light from stars beyond it and give the cloud the appearance of a region devoid of stars.
Darwin Ellipsoids ...
dark nebula
A nebula which does not have an embedded star to illuminate the gases. Instead, a dark nebula blocks the light from background stars and creates a dark patch.
...
Dark Nebula
A nebula consisting of dust and gas blocking our view of more distant stars.
Decameter Radiation ...
dark nebula: A nonluminous cloud of gas and dust visible because it blocks light from more distant stars and nebulae.
Dark Nebula - A dense, interstellar cloud containing enough gas and dust to block the light of background stars. The dimming of background stars gives the appearance of a region with no stars ...
dark nebula located in the constellation Orion; designated IC 434 or B 33. It consists of a cloud of nonluminous interstellar matter resembling the outline of a horse's head and appears against the background of a bright emission nebula.
Dark Nebulae
In essence, all nebulae are in fact dark, for they produce no visual light of their own.
Dark nebulae are massive clouds of interstellar gases and dust, dense enough to block out most of the light from stars behind it.
Dark nebulae are clouds of dust which are simply blocking the light from whatever is behind. They are physically very similar to reflection nebulae; they look different only because of the geometry of the light source, the cloud and the Earth.
Dark nebulae are similar to diffuse nebulae, but they are not seen by their emitted or reflected light. Instead, they are seen as dark clouds in front of more distant stars or in front of emission nebulae.
Finally, dark nebulae are clouds of gas and dust which block the luminosity from any objects behind them.
A prominent dark nebula in Crux, near the Southern Cross, readily visible to the naked eye, about 170 pc distant, located on the galactic plane. [H76]
Coarse-Graining ...
dark dust cloud (dark nebula) A region of interstellar space containing a rich concentration of gas and dust in an irregular but well-defined cloud that obscures the light from stars beyond it.
dark nebula A cool cloud of dust and gas. Due to its low temperature it does not emit light in visible region of spectrum so appears dark, often blocking out light from stars that are behind it. Best example is the Coal sack nebula in Crux.
Note that there are plenty of dark nebulae, HI (neutral hydrogen, pronounced "H-one") regions and giant molecular clouds around that don't seem to be collapsing into stars right now. What triggers the collapse of a cloud to form stars?
This is referred to as a dark nebula or just basically dust. However, under certain conditions, it will not look black but instead will appear blue as is seen on the right.
nebulae: dark nebula, emission nebula, reflection nebula, planetary nebula
Rho Ophiuchi, pleiades
zone of avoidance, interstellar medium, neutral hydrogen emission
cosmic rays
Baade's Window, bulge ...
One of the most famous dark nebulae is the Horsehead nebula in Orion, so named for the silhouette of the dark mass in front of a more luminous nebular region.
Set within the Milky Stream are hordes of clusters and both bright and dark nebulae, many of which are glorious in small telescopes or even binoculars. Just to the west of Antares, and thus easy to find, is the pretty globular cluster Messier 4.
Several Aboriginal cultures see Crux and the Coalsack Dark Nebula as the head of the "Emu in the sky," while to others it represents the sky deity Mirrabooka.
In many cases dark nebulae are part of a larger nebulae complex which provides the light background against which the dark nebulae appears. At infra-red wavelengths young stars not visible at visual wavelengths are often found to be forming.
This complex of intertwined emission and dark nebulae is detectable with a naked eye as a bright area of Milky Way about 2 ° SEE of Deneb (aCygni - see finder chart below).
The third type of nebula crisscross the Trifid in dark bands, and are known as dark nebulae for their light-obscuring effects. Hidden inside these dark lanes are the coalescing remains of earlier birthing episodes.
How are dark nebulae located?
What are nebula examples?
What kind of classifcations are there for nebulae?
Are galaxies nebulas?
What is a nebula?
Wmat makes up the atmosphere on Mars?
Who was Cleomedes?
What made Cleomedes famous?
This is called the Great Rift and it is caused by dark nebulae composed of dust and cold gas. Vela also contains many double and triple stars, several small star clusters and one of the most famous supernova remnants in the sky.
absorption nebula
See dark nebula.
Also on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Transport Concepts & Designs (partner site) ...
Altair is the bright star at
left of the dark nebula.
(See a Digitized Sky Survey
image of Altair from the
Nearby Stars Database.) ...
nebula: Latin for "cloud." Bright nebulas are great clouds of glowing gas lit up by stars inside or nearby. Dark nebulas are not lit up and are visible only because they block the light of stars behind them.
Members of the Inca civilization identified various dark areas or dark nebulae in the Milky Way as animals, and associated their appearance with the seasonal rains. [2] .
The stars in this cluster are so faint that they cannot be resolved with binoculars, but instead appear as only a light smudge. Two dark nebulae form a shape known as "Fish on the Platter". They are located about 1.
Aquila is surprisingly devoid of bright deep-sky objectsin spite of being soaked in the summer's Milky Way. But you'll be fascinated with various dark lanes being tangled in the Milky Way through small binoculars, and especially, dark nebulae B142 ...
Emission nebula are powered by young, massive stars and emit their own light, reflection nebulae shine by reflecting light from nearby massive stars, and dark nebulae, as the name suggests, ...
 See also: Nebula, Light, Star, Dust, Cluster
|
