Scientists have measured the shortest unit of time ever: the time it takes a lightweight particle to cross a hydrogen molecule. 

That point, for the report, is 247 zeptoseconds. A zeptosecond is a trillionth of a billionth of a second, or a decimal level adopted by 21 zeroes and a 1. Beforehand, researchers had dipped into the realm of zeptoseconds; in 2016, researchers reporting within the journal Nature Physics used lasers to measure time in increments all the way down to 850 zeptoseconds. This accuracy is a big leap from the 1999 Nobel Prize-winning work that first measured time in femtoseconds, that are millionths of a billionths of seconds. 

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