Coalsack Nebula
The Coalsack Dark Nebula (or simply the Coalsack) is the most prominent dark nebula in the skies, easily visible to the naked eye as a dark patch silhouetted against the southern Milky Way.
Coalsack
Related Category: Astronomy: General
see Milky Way.
More on Coalsack ...
Coalsack
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.
Coarse-Graining ...
Coalsack
Actually this is not a true asterism, but a dark patch on the Milky Way, in the constellation Crux. By the African Bushmen it was called "Old Bag".
Frederick's Glory
is formed by iota And, kappa And, lambda And and psi And ...
Coalsack Nebula (overlaps into Centaurus and Musca)
Cygnus (Cygni)
Deneb (Alpha Cygni)
Alpha Cygnus ...
Other types of nebulae are dark or absorption nebula such as the Coalsack, planetary nebulae that are actually the ejected outer layers of a dying star and supernova remnants. neutrino A fundamental particle.
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.
Alongside the Southern Cross is a very distinctive dark shape known as the Coalsack, much used by southern hemisphere astronomers as an indicator of a dark sky, especially if the sixth magnitude star embedded in it is visible.
Crux contains a famous dark cloud of gas and dust called the Coalsack Nebula, which appears in silhouette against the bright Milky Way background.
One of the better features in the constellation Crux is the coalsack nebula. A dark patch in the southern Milky Way visible to the naked eye.
Six star clusters reside within the constellation's borders. These are: ...
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 blocks out background stars (e.g., the Coalsack Nebula).
The "Emu in the sky", a 'constellation' defined by dark clouds rather than the stars. A western interpretation would recognise the Crux or Southern Cross, on the left Scorpius. The head of the emu is the Coalsack.
Late O-type or early B-type stars (O8 to B4) in whose spectrum the lines of some of the elements C, N and O are weaker or stronger than in the standard stars. [JJ95]
Coalsack ...
no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes. The largest dark nebulae are visible to the naked eye, appearing as dark patches against the brighter background of the Milky Way. An example is the Coalsack in ...
 See also: Nebula, Milky Way, Constellation, Cluster, Light
  
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