ATTOSECOND

(A billionth of a billionth of a second.) The most fleeting events that scientists can clock are measured in attoseconds. Researchers have created light pulses lasting just 53 attoseconds using high-speed lasers. Although the interval seems unimaginably brief, it is an aeon compared with the Planck time—about 10–43 second—which is believed to be the shortest possible duration.