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Antimatter annihilation. Coloured computer plot showing evidence for the first large-scale production of antimatter. The yellow/red ring in the plot at left shows where atoms of antihydrogen have annihilated on contact with the walls of the trap used to contain them. Antihydrogen is the antimatter equivalent of a hydrogen atom. It comprises a positron (an antimatter electron) and an antiproton. The antihydrogen was produced by mixing positrons with antiprotons at a very low temperature. At higher temperatures (right), no annihilations are seen on the walls of the trap. This work was done at the CERN laboratories in Geneva, Switzerland.
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