A nanosecond (ns) is a unit of time in the metric system, equal to one billionth (10-9) of a second (s). The second is the base unit of time in the International System of Units (SI), making the ...

Time, the fourth dimension of the world man lives in, is measured by the motion of the earth. The basic unit of time is a day: one revolution of the earth. But recently the battered old earth has ...

Scientists successfully measured an event using zeptoseconds, which is an incredibly brief fraction of a second. The time it took for a photo to pass through a hydrogen molecule was measured at 247 ...