How long is a second?

true

A second is classically considered to be as long as "one Mississippi." The Mississippi is 2,320 miles long.

Therefore, a second is 2,320 miles long.

Slightly longer than a first.

the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom

Should be noted that this seemingly random measurement was decided since the original definition of a second was just a sixtieth of a minute, which was a sixtieth of an hour, which was a twenty-fourth of a day, which was ~365th of a year. These numbers were chosen because they had a lot of factors so they were easy to work with casually, except for the day which was decided by the time it takes for a day-night cycle to complete and the year which was the amount of days it took for the season cycle to complete.

Since the duration of a day and a year is not constant and is arbitrary on any location other than Earth, scientists based it on the atomic clock and found this measurement to be extremely close to the day-based second.

So if we ever meet aliens in space or something and they have no idea how long Earth's revolution is, then they can get a grasp on it based on cesium atoms assuming they have sufficient knowledge in chemistry and physics.

a second, next question.

1 second longer than the OP hss gone without sucking a cock in the past year

I disagree with that, thus it is fake news

But how do we deal with relativism???
Which reference frame do we use?

The only real answer

the amount of time it takes for light to travel 1/299 792 458 m

in a vacuum

tp/(5.39 × 10−44)
where tp is Planck time