Help: Sound created over/in subspace??? (SciFi) I know nothing, called basic high school physics and chemistry. However, do not hold back in your answers I do find ways to comprehend what people tell me. This might be a silly question but since audible "sounds" can't travel over empty 3dimensional space and there is no such thing as sub-space would it be possible to "hear" frequencies and disturbances somehow use a "radar" other than radio telescopes over extreme distances??? I know I am only thinking in waves and not other energy forms but this is the basics of my (lack of) knowledge. This is SciFi but I am pretty serious as to where this answer takes me. Science Fiction always amazes me because it's only fiction for a small amount of time. Compared to civilization and even the universes timeline. Thanks and I hope I am not wasting your relative time!