Meet the zeptosecond, the shortest unit of time measured

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Scientists have measured the shortest unit of time so far: the time it takes a light particle to cross a hydrogen molecule.

This recording time is 247 zeptoseconds. A zeptosecond is a trillion billionths of a second, or a decimal point, followed by 21 zeros and 1. Previously, researchers plunged into the zeptosecond range; in 2016, researchers reporting in the journal Natural physics used lasers to measure time in increments of up to 850 zeptoseconds. This accuracy is a major leap forward from the 1999 award-winning Nobel Prize, which for the first time measured time in femtoseconds, which are millionths of a billionth of a second.

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