Gourt > Games > Roleplaying > Genres > Science Fiction > Alternity > Dark Matter
- This refers to the cosmological use of the term. For other uses, see Dark matter (disambiguation)
In cosmology, dark matter refers to matter particles, of unknown composition, that do not emit or reflect enough electromagnetic radiation (light) to be detected directly, but whose presence may be inferred from gravitational effects on visible matter such as stars and galaxies. Dark matter explains several anomalous astronomical observations, such as anomalies in the rotational speed of galaxies (the galaxy rotation problem). Estimates of the amount of matter present in galaxies, based on gravitational effects, consistently suggest that there is far more matter than is directly observable. The existence of dark matter also resolves a number of seeming inconsistencies in the Big Bang theory, and is crucial for structure formation.
The dark matter component has vastly more mass than the "visible" component of the universe At present, the density of ordinary baryons and radiation in the universe is estimated to be equivalent to about one hydrogen atom per cubic meter of space. Only about 4% of the total energy density in the universe (as inferred from gravitational effects) can be seen directly. About 22% is thought to be composed of dark matter. The remaining 74% is thought to consist of dark energy, an even stranger component, distributed diffusely in space. baryonic dark matter) makes a contribution to dark matter, but constitutes only a small portion *" target="_blank" >[http://arxiv.org/abs/astro-ph/0002058. Determining the nature of this missing mass is one of the most important problems in modern cosmology and particle physics. Its urgency is underlined by David B. Cline in a 2003 article in Scientific American, in which he writes: "The terms . . . 'dark matter' and 'dark energy,' serve mainly as expressions of our ignorance", much as the marking of early maps with 'Terra Incognita'.
More on [ Dark matter ]
Just bought a Dark Matter Stock. #epicpetwars http://www.epicpetwars.com
MK5586 (Michael Kuhn) Thu, 17 Dec 2009 00:10:15 -0000
Just bought a Dark Matter Stock. #epicpetwars http://www.epicpetwars.com
Completed Dark Matter Excavation #epicpetwars http://www.epicpetwars.com
VANNMAN14 (Chris Vann) Thu, 17 Dec 2009 00:08:53 -0000
Completed Dark Matter Excavation #epicpetwars http://www.epicpetwars.com
Just bought a Dark Matter Stock. #epicpetwars http://www.epicpetwars.com
aznboix503 (thanh trang) Wed, 16 Dec 2009 23:57:24 -0000
Just bought a Dark Matter Stock. #epicpetwars http://www.epicpetwars.com
Completed Dark Matter Excavation #epicpetwars http://www.epicpetwars.com
Oxakiller (Chris Shepherd) Wed, 16 Dec 2009 23:51:31 -0000
Completed Dark Matter Excavation #epicpetwars http://www.epicpetwars.com
Completed Dark Matter Excavation #epicpetwars http://www.epicpetwars.com
XJavi12X (Javier Alvarado) Wed, 16 Dec 2009 23:35:36 -0000
Completed Dark Matter Excavation #epicpetwars http://www.epicpetwars.com
Okay, better link: http://resonaances.blogspot.com/2009/12/dark-matter-discovered.html
loisbeckett (Lois Beckett) Wed, 16 Dec 2009 23:34:56 -0000
Okay, better link: http://resonaances.blogspot.com/2009/12/dark-matter-discovered.html
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Dark Matter in the Bay Area - Character descriptions and links.
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Uncle Jimbo's End of Time Blues - Additions and concepts.
WebRing: darkmatter - Group of interlinked sites also known as the Dark Matter ring.
Meta Description: [ A dark ring. ]
WebRing: darkmatteraltern - List of member sites in the Dark * Matter - Alternity RPG web ring.
Meta Description: [ This Ring is for the Dark Matter Alternity RPG Campaign Setting, a world of modern day conspiracy, aliens, the occult and horror. ]
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