Gold-gold heavy ion collision. Computer display showing the tracks of as many as 1000 charged subatomic particles created in a head-on collision of gold ions in the STAR detector at RHIC, the Relativistic Heavy Ion Collider at the Brookhaven National Laboratory (BNL) on Long Island, New York. In this 'end view' of the cylindrical detector, the gold ions have collided at centre. Heavy ion collisions of this kind are being used to search for evidence of quark-gluon plasma (QGP), a state of matter consisting of a dense, energetic 'soup' of quarks & gluons.

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