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.
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.
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