What is anti matter and dark matter?

Question

And how could anti matter be created?

Answer 1

Anti- matter is matter similar to that which exist naturally but has an opposite charge. Example is the positron which has the same equivalent energy as the electron but has a positive charge.

DIRAC's "HOLE THEORY" states that when sufficient energy is imparted to matter in the negative state, it transcends unknown barriers and come to existence in the positive state leaving a void in the negative state.

The apparent proof to this theory was the result of the Anderson experiment which was done later.

In the experiment a 2MEV gamma was focused to an aluminum foil target and two particles were created apparently from nothing; an electron and a positron. This is called pair production.The positron is the anti-particle or anti-matter. Each particle has an energy equivalent of 0.511MEV. When an electron and a positron annihilate each other, their masses simply cancel out but the annihilation results in the release of the energy that created them, which is a 1.02MEV gamma.

Other particles are known to have anti-particle counterparts.

Dark matter is the term used to denote the matter equivalent  of the ZERO Point Energy or residual Big Bang Energy which constitute the bulk of the total energy of the universe other than the equivalent energy of all the physical bodies(all galaxies combined)..

Answer 2

Antimatter is like regular matter but with opposite charge.

It is created pretty much equally with matter.  You create an electron and its anti-particle, the positron together.  And they can annhilate one pretty much the same way they were created but in reverse.  Colliders make matter and anit-matter in abundance.  The anti-matter doesn't stick around long, though, because it annhilates with the all the matter around, so creating and storing a significant amount is very difficult.

We don't know what dark matter is.  We only know it exists because astronomers can detect the force of gravity it exerts on galaxies.  It appears to be clustered in a big ball around the galaxy, which impacts how fast the galaxy spins.