| Antimatter is matter composed of antiparticles, such as positrons, antineutrons and antiprotons. |
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| Note that subatomic particles sometimes have antiparticles, with opposite charge and spin, that are the same ones going backwards in time. |
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| Some neutral particles such as photons are their own antiparticles, while others like neutrons have antiparticles with opposite magnetic moments. |
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| Antiparticles have opposite charges and certain other quantum properties of opposite sign. |
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| At about one second into the life of the universe, the majority of existing particles and antiparticles had been destroyed to produce photons of electromagnetic radiation. |
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| Positrons, antiprotons and other antiparticles can be routinely created at particle accelerator labs and can even be trapped and stored for days or weeks at a time. |
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| At the subatomic level, for example, particles should behave like their alter egos, called antiparticles. |
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| While antimatter is rare, a huge amount of energy is released when particles collide with antiparticles, which many see as a new form of energy. |
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| It follows that somewhere antiworlds consisting of antiparticles are bound to wander. No traces of these antiworlds have as yet been found. |
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| Antiprotons, the relatively exotic antiparticles of the proton, are difficult to create and were not to be squandered. |
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| This theory should also apply to the muon and tauon and corresponding antiparticles. |
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| Antimatter is, in some sense, a mirror image of matter, in the sense that antiparticles have the same or exact opposite characteristic of particles. |
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| By using electrons and their antiparticles rather than protons, as the LHC does, physicists hope to gain a different perspective on the underlying physics. |
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| According to superstring theory, to describe the motion of a string we need eleven dimensions, plus antiparticles and a mirror image of particles, called superparticles. |
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