Positronium is a particle that has no actual nucleus, but has a positive (positron) and negative (electron) particle. The positron is antimatter as it has the opposite charge to an electron, which is negatively charged.

Scientists have found a way to freeze the particle with lazers, which will allow further study.

You can read a little more on the BBC Website. While the research was published in Physical Review Letters.. Article can be found here



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