What is anti-matter?

Gnomon

Anti-matter is a name physicists give to a type of matter in which particles similar to electrons but positively charged orbit around a negatively charged nucleus. This is the opposite charges to ordinary matter. Physicists can create anti-matter in a laboratory in tiny amounts, but it is shortlived because as soon as it collides with normal matter, there is a violent explosion. The positive particles and the negative particles 'annihilate' each other, disappearing and being replaced by a huge amount of pure energy (in the form of electromagnetic radiation). This explosion carries with it a greater force than that of hydrogen bombs. One of the great mysteries of physics is why is the universe made of normal matter rather than equal quantities of matter and anti-matter. There is nothing in the theories of the creation of the universe that should favour one over the other. Sep 23 02, 12:15 PM

darthrevan89

In particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. http://en.wikipedia.org/wiki/Antimatter Feb 19 09, 4:28 PM

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What is antimatter? Is antimatter natural, and if so, where is it found and how does it work?