[maze-le]

0Hz is a constant value -- 0Hz means the electromagnetic field does not oscillate. The lowest frequency concievable would be something like ~2.2978 10E−18 Hz -- one period every 13.8 billion years.

[0]: https://en.wikipedia.org/wiki/Orders_of_magnitude_(frequency...

[jacquesm]

In a way the expansion of the universe is one half of a giant wave.

[totetsu]

can a 0Hz wave move through space? or is it just a static field..

[maze-le]

You can think of it as the "static" component of a variable field. Frequencies above 0 Hz oscillate, and the 0 Hz component keeps a static value.