To the best of scientists knowledge anti matter was pretty much cancelled out in the big bang through a parity symmetry violation, which resulted to the best of our knowledge in an antimatter free universe. However no one knows this for sure. Anti matter, however is regularly created in particle accelerators and its behavior is well known with the exception of its reaction to gravity. There has never been enough produced to test this. The energy required to produce even a small amount of anti matter is prohibitive and it isn't clear how enough could be produced economically to enable it to be used as a fuel. It can be contained in an electromagnetic containment system but this is also very expensive. Dirac first postulated the existence of AM and it has even stranger properties in relation to the zero point energy of the universe.

• Re: anti-matter - Alain_Lalonde/">Alain Lalonde - January 16, 1999 - 03:46 UTC
• Galaxies of Matter-Antimatter Stars - normhansen - July 6, 2001 - 22:14 UTC