By the ineeny teeny numbers go we..

An attosecond is a very short unit of time that is equal to one quintillionth of a second, or 10⁻¹⁸ seconds.

To put it in perspective, an attosecond is to a second what a second is to about 31.71 billion years.

Scientists use attosecond pulses of light to study the ultrafast… pic.twitter.com/uaY7sIsClq

— Physics In History (@PhysInHistory) October 4, 2023