Of course in space there is no sound transmitted via air, so there is no air-borne sound, but there is structure borne sound. This sound can be recorded with a pickup microphone, but do pickup microphones need air to work as well?
Considering that a pickup is really just recording the surface waves, but if it is mounted on the same surface with the same vibrations, it in theory should measure nothing, correct? My assumption is that pickups measure the difference between the air damped surrounding and the material itself, so it should not work in vaccum as there is nothing to damp against.
The other theory I have is that it depends on the mounting of the microphone. So if I fully connect it in a sphere around a certain point, it would measure the surface wave within this mounting area, but wouldn't that limit the measurement to sound waves smaller than the mounting area (higher frequencies)?