Science: An Anti-Matter Universe?

The anti-proton—atomic twin of the proton but with a negative rather than a positive charge—was once only a well-reasoned theory. Nuclear physicists knew the particle must exist, but not until last year did they lay hands on one, and then they had to create it themselves (TIME, Oct. 31 et seq.).

Since then, many scientists have wondered if all nature is as balanced between matter and antimatter as the atom is between positive and negative charges. If so, where are all the antiprotons to balance the protons that help make up the known universe?...

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