The smallest MEASURABLE time unit known today, 1x10^(-24) seconds. Obviously, smaller units of time exist, but proper equipment and methodology for measuring them does not yet exist. Light travels 2.9979x10^(-16) meters in one yoctosecond, not the 3.33km stated above.
by iNsAniTy August 5, 2005
The smallest unit of time known today. It is on septillionth of a second, or about 0,000000000000000000000001 second(10^-24).
by Tom Something July 15, 2005