A unit of time equal to one thousandth of a second, used to describe the duration of fast radio bursts.A millisecond is a unit of time equal to one thousandth of a second (10^-3 s). It is a human-scale interval that becomes significant in physics when dealing with fast processes, such as the rotation of neutron stars, the duration of fast radio bursts, or the timing of high-speed electronics. In astrophysics, millisecond pulsars spin so rapidly that their rotation periods are measured in milliseconds, providing precise cosmic clocks.
The millisecond as a unit has been used since the adoption of the metric system in the late 18th century. Its importance in physics grew with the discovery of millisecond pulsars in 1982 by Don Backer and colleagues.
Time intervals are measured using periodic phenomena, such as atomic vibrations or the rotation of celestial bodies. A millisecond is defined as 1/1000 of a second, which itself is defined by the cesium-133 atom's hyperfine transition frequency. In practice, instruments like oscilloscopes and time-to-digital converters can resolve events at the millisecond scale, and even faster.
Millisecond timing is essential in telecommunications, GPS systems, and high-frequency trading, as well as in studying fast astrophysical phenomena like fast radio bursts and pulsar timing arrays.
A millisecond is about the time it takes a housefly to flap its wings once, but a neutron star can spin around 700 times in that same interval.
