Wikipedia:Today's second feature/September 24, 2005

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Gold Beam-Beam Collision Event at the Relativistic Heavy Ion Collider recorded by the STAR detector

Particle physics is a branch of physics that studies the elementary constituents of matter and radiation, and the interactions between them. In the experiment illustrated here, particles erupt from the collision point of two relativistic (100 GeV) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. Electrically charged particles are discernable by the curves they trace in the detector's magnetic field.

Image credit: RHIC

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