Some Like It Cold E-mail and Web Information Antimatter confinement apparatus that Harvard students and professors in Geneva used to store cold positrons and antiprotons simultaneously. Yes, antimatter does exist. Professor of physics Gerald Gabrielse has been trying to make cold antimatter for 10 years. He hasn't done it yet, but an experiment last December left him and his international team very close. Now all he needs is to get more of them to interact.
Antimatter does occur naturally.
Radioactive decay can create some positrons, and occasionally, when a particle from outer space hits our atmosphere, the debris from the collision may contain some antiprotons. But these events are extremely rare. Hence, the need to study antimatter by making some from scratch. Knowledge of the two antiparticles has been around for a while. After a 1928 theory predicted the existence of both, positrons were discovered in 1932 and antiprotons in 1955.