Antihydrogen does not naturally occur on Earth; physicists first synthesized it in 1995 at CERN. But these particles moved at nearly the speed of light and disappeared in 40 billionths of a second. It would take another 7 years before physicists could produce near-motionless antihydrogen that would not immediately knock into regular matter and annihilate. And it wasn’t until 2010 that they could successfully trap and store antihydrogen. Hangst’s team can now perform experiments for up to 24 hours at a time on the antihydrogen, 12 orders of magnitude in 25 years

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