When matter and anti matter is combined, they are both annihilated, so it is called annihilation. This is why physicists are so confused - we don't know why there is matter left in this universe, if matter and anti matter were both created in equal quantities in the big bang.
That is not currently known. There is a slight assymetry between matter and antimatter, but so far, it seems that this assymetry is not enough to explain why there is only matter, and hardly any antimatter, in the Universe. Without such an assymetry, there wouldn't be either matter or antimatter in the Universe - just radiation. For more information about what is known, and what isn't, check the Wikipedia article on "Baryon asymmetry".
PCH: Antimatter
when matter and antimatter combines, it will forms a flash and both will disappear. Disappear means its not like magic. Its is a reaction proved by research. Research is still going on in CERN. Matter is a thing which is everything present in the world in every state. (solid, liquid and gas). But antimatter is not at all existing in milky-way galaxy. But we can generate anitimatter.
That is one of the unsolved problems in cosmology. There seems to be a slight difference between matter and antimatter, that is, the symmetry between matter and antimatter is not perfect. But the details of baryogenesis are not known yet.
This question presupposes the existence of an antimatter reactor. As far as I know, no such reactor exists, or has even been designed. Antimatter reacts with matter to produce energy with virtually no matter remaining. Such a reaction is thousands of times more powerful as nuclear reactions we have used on this planet. But antimatter is difficult to make and nearly impossible to handle. As soon as it touches anything, it is gone. There is a lovely quote from a researcher who has made antimatter often. He said that if all the antimatter made at CERN were put together and reacted with matter, the resulting energy would power a light bulb for a few seconds. This even though it is the most powerful reaction we know of. There just is not enough of it to react usefully.
Matter, or antimatter.
When antimatter comes into contact with matter, they annihilate each other.
Initially the 9g of remaining matter would survive. Each particle of antimatter can only annihilate with one other particle of antimatter. At this point the 1g of antimatter would cause an explosion equivalent to that of 200000 pounds of TNT. Causing both groups of matter and antimatter to be obliterated.
No, Antimatter while annihilate our matter, meaning that it will completely convert our matter to light and heat, however antimatter is highly theoretical, and the LHC probably will not create any.
1. Why is there more matter than antimatter in the Universe? Or: Why is there matter at all? (If there were the same amount of matter and antimatter, and it came into contact, it would quickly get destroyed. 2. If antimatter is so abundant, how come we've never come in contact with it or have been able to observe it?
You are giving the definition for the Big Bang Theory.
In the early universe, matter and antimatter were created in equal amounts. As the universe cooled and expanded, there was a slight imbalance in favor of matter over antimatter. This allowed the matter to survive and form the structures we see today, while most of the antimatter annihilated with matter, resulting in the predominance of matter in the universe.