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Dark matter is:
In article ,
jacobnavia writes: If the sea of galaxies extends to infinity (or to huge distances) the farther you look, the more galaxies you will observe for a given solid angle. At great distances you will see a wall of galaxies that fills completely the view. The (very red-shifted) light from those galaxies is the CMB. As JT pointed out, this is closely related to Olbers' Paradox; the resolution of which is well known. The point is that the "light from these galaxies" cannot fit the spectral energy distribution (SED) of the CMB. If you don't know what an SED is, have a look at http://coolwiki.ipac.caltech.edu/index.php/SED_plots which defines it. (The article is over-simplified in places, and I don't agree with the "Units Matter" section, but the definition of SED and basic explanation of it are accurate.) "Sea of galaxies" was a possible model for the CMB until COBE flew, but that model is inconsistent with COBE and later data. -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
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