Why does the universe exist?
Is there a scientific reason why the universe exists? In other words, what is the science of why there is anything at all, instead of only nothing?
The answer has to do with opposites. Scientists have found that the universe exists because it began with a slight imbalance between matter and antimatter. Particles of matter — that is, all of the electrons, protons and neutrons in the atoms and molecules of regular stuff — differ from particles of antimatter, which carry the opposite electric charge but are similar in many ways.
Matter and antimatter do not get along. When their particles collide, they annihilate each other in an intense burst of gamma-rays. Fortunately, antimatter is now extremely rare. Although antimatter had a foundational role in the formation of the universe, the fact that there is now so little of it is one of cosmology's great mysteries.
The answer has to do with opposites. Scientists have found that the universe exists because it began with a slight imbalance between matter and antimatter. Particles of matter — that is, all of the electrons, protons and neutrons in the atoms and molecules of regular stuff — differ from particles of antimatter, which carry the opposite electric charge but are similar in many ways.
Matter and antimatter do not get along. When their particles collide, they annihilate each other in an intense burst of gamma-rays. Fortunately, antimatter is now extremely rare. Although antimatter had a foundational role in the formation of the universe, the fact that there is now so little of it is one of cosmology's great mysteries.
Cosmic leftovers
Using observations from particle colliders, traces of the decay of antimatter in astronomical spectra, and gravitational waves, physicists are trying to better understand why there is this large unexplained discrepancy in the universe that has given rise to everything it contains.
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