What is Anti-matter?

Answer 1

In quantum physics, physicists have found that when creating matter (like in a super collider), anti matter is also invariably created. This simply means that for every quantum type, there should be an anti-quantum type that is similar in most respects, but opposite in spin, color, or charge or some characteristic like that. [See source.]

Thus, for example, an electron should have an anti-electron somewhere in the universe. About 13 seconds after the big bang, the universe was filled with electrons and anti-electrons. But then, on further cooling, the two types annihilated each other and photons (light) resulted.

But there was a slight imbalance, percentage wise, there were a few more electrons than anti electrons when they began to wipe each other out. As a consequence, anti electrons are now rare and have been observed only in super colliders and such when matter is created from energy.

As are all the other anti matter particles. Some posit there might be somewhere in our universe where the anti matter quanta outnumber the ordinary quanta, but that place has not yet been found.

Answer 2

Very roughly anti-matter consists of particles that are identical to matter but opposite in charge (roughly...). This means that if matter and anti-matter come into contact they will annihilate each other leaving only energy (light). Anti-matter can be created here on Earth but is very rare in the universe. This is only a brief explanation and there is much more literature on the subject (Wikipedia).

Answer 3

antimatter