Nobody said anything about dark matter: We like symmetry, Dr. Kharzeev, of Brookhaven, noted, but if the symmetry between matter and antimatter had not been br

Nobody said anything about dark matter: We like symmetry, Dr. Kharzeev, of Brookhaven, noted, but if the symmetry between matter and antimatter had not been broken long ago, “the universe would be a very desolate place.” The reason why universe would be a very desolate place is because if there was symmetry between matter and antimatter, they would immediately annihilate themselves. Why exactly is the observable universe composed almost entirely out of matter and not antimatter is now one of the greatest unsolved problems in physics, although several hypotheses exist - some of which even propose that there is also a universe composed almost entirely out of antimatter.