Quirks and Quarks

If sound needs air to travel, and there is no air in space, then how are sounds like Saturn's rings recorded?

Because there is no sound in space, what can be heard however, is data represented as sound.
Saturn's rings (NASA/JPL/Reuters)

It is true that sound requires air to travel.  It is also true that there is no air in space.  Therefore, according to Dr. Christa van Laerhoven from the Department of Physics and Astronomy at the University of British Columbia when we hear a recording of Saturn's rings for example, we are actually hearing radio waves, or data, that is represented as sound according to its frequency.