Yes, outer space is completely silent because sound needs a medium, like air, water, or a solid surface, to travel. Sound waves are vibrations that move through particles, but in the vacuum Vibration Tests for Moon Rocket Help Ensure Safe Travels on Road to Space NASA Iphone vibriert nicht mehr bei Anrufen, woran liegt das? (Apple, Anruf) Space crafts are tested with concert speaker. It is a direct field acoustical testing. Basically one of the loudest sound systems in the world blasts the object to see what vibrates loose. : Nicht stren richtig einrichten: Zeitplne & Ausnahmen auf iPhone und Android TechZeitgeist