Dark nebulae



A dark nebula or absorption nebula is a type of interstellar cloud that is so dense it obscures the light from objects behind it, such as background stars and emission or reflection nebulae. The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger  molecular clouds. Clusters and large complexes of dark nebulae are associated with Giant Molecular Clouds. Isolated small dark nebulae are called Bok globules.

Dark clouds appear so because of sub-micrometer-sized dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths. Also present are molecular hydrogen, atomic helium, C18O, CS, NH3 (ammonia), H2CO (formaldehyde), c-C3H2 (cyclopropenylidene) and a molecular ion N2H+ (diazenylium), all of which are relatively transparent. These clouds are the spawning grounds of stars and planets, and understanding their development is essential to understanding star formation.

The form of such dark clouds is very irregular: they have 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 like the Coalsack Nebula and the Great rift. These naked-eye objects are sometimes known as dark cloud constellations and take on a variety of names.

Garibaldi Scooping vs. Union
In 3899 OTT Garibaldi Scooping claimed the entirety of the Staragon Dark Nebulae to be comnpany property and based this claim on the universally accepted space salvage law. SII Space Matter and Enroe Corp also were in the process to declare entire nebulae theirs. The Union Supreme court found that the space salvage law did not specify the size of a claimed object and demanded a clear definition of "object".

The case was brought before the Assembly and after a docket session on this subject the Assembly declared nebulae can not be claimed by a single endity unless this entity could exercise control over all dust particles it contained and defined the space salvage law in more detail.