What is the minimum distance for sound to be heard in outer space?

Since sound requires a non-vacuum, I would think it would require touching.

Touch. Sound is vibrations of air molecules hitting your ear drum. No air in space, no molecules to vibrate, no sound transmission.

There actually is sound in space, because space is not a perfect vacuum.
The sound is just so low amplitude and low frequency, that humans can not hear it.
https://www.youtube.com/watch?v=lDzBe0_SLVo

Touching. like through metal. All other space betweens, zero.