Veil of The Rim
The Veil of The Rim is a very large giant molecular cloud. It has maximum dimensions of 200 parsces coreward-rimward, 400 parsecs spinward-trailing, and covers all or part of 55 sectors, nearly 1% of the estimated area of the Great Void. The density and size of the cloud permits the formation of molecules such as molecular hydrogen (H2), carbon monoxide (CO) and ammonia (NH4). The Cloud's mean density is around 100,000 particles per cm³. It has an interior structure consisting of a complex pattern of filaments, sheets, bubbles, and irregular clumps.
The Veil of The Rim is incredibly diffuse – other than a few of its denser regions it is not visible to the naked eye, and is barely discernable to anything other than sophisticated and sensitive astronomical devices. Despite its immense size, a traveller passing through the Veil would barely notice its presence.
The Veil of The Rim is moving in a generally spinward-rimward direction relative to the Orion Arm, with the retreating coreward edge of the cloud occupying the very rimward parts of Denison, Wayland and Quell Sectors. In a few millions of years the last traces of the cloud, other than a few fragments that have condensed into nebulae around stars, will have moved away from the area.
Features Within the Veil
- Carbon Nebula: a concentration of gas and dust lying within the coreward part of the Veil. It is backlit by Nielsen's Cluster.
- Dawson's Divide: an empty region cutting across the trailing part of the Veil. Dawson's Divide has dimensions of approximately 120 parsecs coreward-rimward and 30 parsecs spinward rimward and has a mean density of less than 100 particles per cm³.
- Feline Nebula: a concentration of gas and dust lying within the central-coreward part of the Veil. It is backlit by Nielsen's Cluster.
- Nielsen's Cluster: a concentration of extremely large stars lying close to the center of the Veil. The cluster has dimensions of approximately 10 parsecs coreward-rimward by 20 parsecs spinward-trailing and contains more than a hundred stellar bodies.
- Nielsen Nebula: a reflection nebula made up of the gas and dust lying close to the stars that form Nielsen's Cluster. It bears similarities to the Cauldron Nebula in Cauldron Sector.
- Towers of Genesis: a stellar nursery lying towards the rimward edge of the Veil. It lies within a particularly dense region of the Veil and is largely masked by concentrations of dust.
- Tremblay Divide: an empty region lying across the spinward part of the Veil. The Tremblay Divide has dimensions of approximately 150 parsecs coreward-rimward by 20 parsecs spinward-rimward and has a mean density of less than 1000 particles per cm³.
The feature was officially detected by the University of Selasia Spinward Survey. The true dimensions of the Veil became public knowledge following publication of the "Stars of the Rim" Astrographic Survey in 5570AD, although many of its internal features have been known of for millennia.
Worlds & Sectors (Astrography)
- Denison Sector
- Quell Sector
- Wayland Sector
- Rimward extents within the Great Void, beyond the above named sectors
World Listing: 1105
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