Instruments typically used to detect the ground motion of earthquakes can also be used to identify the type of aircraft flying far overhead, research by University of Alaska Fairbanks scientists shows ...
Spotter planes can no longer directly see enemy submarines. Today, their mission is overwhelmingly acoustic—listening to ...
Researchers at Stanford University have developed a new type of sonar to overcome the previously insurmountable problem of seeing underwater from the air. Sound does not travel easily between air and ...