Dark Matter
In astronomy and cosmology, dark
matter is a type of matter hypothesized to
account for a large part of the total mass in the universe. Dark matter
cannot be seen directly with telescopes; evidently it neither emits nor absorbs
light or other electromagnetic radiation at any
significant level. Instead, its
existence and properties are inferred from its gravitational effects on visible
matter, radiation, and the large scale structure of the universe. Dark matter
is estimated to constitute 84% of the matter in the universe and 23% of the
mass-energy.
Source: wikipedia, NASA
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