DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Special effects zoom photograph of a particle interaction in the UA1 detector at CERN, the particle physics laboratory outside Geneva. The UA1 detector, which discovered the W & Z particles in 1983, records the collisions of protons & anti-protons accelerated to very high energy in CERN's SPS collider. When a proton and antiproton collide, they annihilate into pure energy which rematerialises as a large number of new particles that spray out in all directions. The photograph symbolises the explosive appearance of such interactions. The detector itself is outlined in red.
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