The TRANSMISSION of acoustic energy through a medium via a SOUND WAVE. See: SOUND ... Wiener and Keast, "Experimental Study of the Propagation of Sound Over Ground," Journal of the Acoustical Society ...
DARPA is Using Earth’s Atmosphere as a Sensor to Detect Secret Explosions and Spacecraft Reentries
DARPA is using Earth’s atmosphere as a powerful sensor, allowing the detection of events like rocket reentries and illicit ...
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