Matter/Anti-Matter

If matter were to come into contact with anti-matter, would it destroy our universe?  Does it matter how much content there is of each form of matter?  Why or why not?

>>1
The matter and antimatter involved would be annihilated completely, being converted into pure energy in the amounts E=mc^2. The universe would not be at risk, but the immediate area could be damaged by the sudden presence of lots of energy. Therefore, antimatter could become a usable weapon in the future if we ever find a way to handle it - a minuscule part of the target would be annihilated, and the target would explode or just evaporate because of the extreme heat.
The total amounts of each form of matter matters (no pun intended) quite a bit in theoretical physics: for instance, certain systems predict that there must always be equal amounts of matter and antimatter in the universe, which appears to be contradicted by reality.

>>1
scientist already do experiments of that, antimatter is not something that special. a positron and an electron fall into each other and turn into a two equivalents of gamma radiation. total annihilation is out of question, they turn into electromagnetic waves.

>>3
that is also evidence to whereabouts of black holes. since they attract matter from space the falling particle-antiparticle pairs collide and annihilate each other frequently emitting light at characteristic wavelengths.

yeah, put them together and...OH SHI-!!!!

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If there are black holes full of matter, are there white holes filled with anti-matter??!!??!!oneoneeleven???

What happens if a white anti-matter hole and a black hole just so happend to come into contact?  I'm saying both are substantial in size.

white anti-matter hole
wat?
I think ive heard of these, arnt they just like pushy black holes instead of pully black holes?