BBC NEWS | Science/Nature | Cosmic crash unmasks dark matter

BBC NEWS | Science/Nature | Cosmic crash unmasks dark matter: "Striking evidence has been found for the enigmatic 'stuff' called dark matter which makes up 23% of the Universe, yet is invisible to our eyes.

The results come from astronomical observations of a titanic collision between two clusters of galaxies 5.7 billion light-years away.

Astronomers detected the dark matter because it separated from the normal matter during the cosmic smash-up."