Scientists start mapping the hidden web that scaffolds the universe
(PHYSorg.com Space & Earth)

After counting all the normal, luminous matter in the obvious places of the universe-galaxies, clusters of galaxies and the intergalactic medium-about half of it is still missing. So not only is 85% of the matter in the universe made up of an unknown, invisible substance dubbed `dark matter,` we can`t even find all the small amount of normal matter that should be there.