At the beginning of time, just moments after the Big Bang, numerous particles came into existence; at the same time, an almost equal number of antiparticles appeared. These subatomic exotics are nearly identical to their ordinary particle kin, but differ in some key ways. When matter and antimatter meet, the two annihilate one another, which means that the dawn of the universe included a spectacular microscopic fireworks display.
Antimatter is sort of like a mirror to ordinary matter, having the same mass but an opposite charge. Neutrinos, which have no charge, are thought to be their own antiparticles, although experiments have yet to confirm this theory. Along with being created shortly after the Big Bang, antimatter can arise from a wide variety of nuclear processes, and can exist for a short time in any of the particle accelerators worldwide.
A persistent mystery
In 2018, scientists were even more perplexed when they made the most precise measurement of antimatter to date and found that antimatter and matter behave nearly identically. The finding suggests that particles and their opposites should have been created in equal numbers at the beginning of the universe; however, if true, the fact that matter prevails over antimatter is ever more difficult to reconcile.
Researchers are diligently seeking the factor that explains the dominance of matter over antimatter in our cosmos. Calculations suggest that just after the Big Bang, when particles and antiparticles annihilated one another, there was a slight imbalance in their numbers. Less than one in every billion ordinary particles survived the melee and went on to form all the matter around us today. But why? Scientists worldwide are working to determine if a neutrino acts as its own antiparticle, which would have allowed a small fraction of neutrinos to transition from antimatter to matter at the universe's inception. In this scenario, a slight matter imbalance would have existed back then.
Antimatter has been created and sustained in small quantities in particle-physics laboratories. Some research teams have gone so far as to create antiprotons, and drive them around in a van so that physicists at CERN could transport them to a nearby facility.read more http://tinyurl.com/2ycm3e93
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