One of the most fundamental and curious mysteries in the universe is the fact that anything exists at all. That is because during the Big Bang, equal amounts of matter and antimatter particles should have been created — antimatter being like the "opposite" of regular matter, meaning it's made up of antiprotons and antielectrons. And when matter and antimatter particles meet, they are mutually annihilated.
That means in a universe split up into matter and antimatter, large structures such as galaxies, stars, planets, moons and even our bodies should struggle to exist. Thus, some early quirk of the universe must have eliminated antimatter and allowed a matter-dominated cosmos to prosper. For some time, scientists have been keenly searching for evidence of what this type of event might be.
