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.
Physicists announced last Wednesday that they have discovered the most convincing evidence yet of the existence of
dark matter.
Members of an international team gathered at Nasa in Washington and
Cern in Switzerland to report their findings, which come from a $2bn
particle detector mounted to the International Space Station.
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