DARPA accidentally detects SpaceX Falcon 9 rocket reentry by listening to Earth’s atmosphere
[ad_1] Researchers with the U.S. military’s Defense Advanced Research Projects Agency (DARPA) have successfully used Earth’s atmosphere as a sensor to detect a distant disturbance. DARPA’s AtmoSense program aims to study how sound waves or electromagnetic frequencies travel through Earth’s atmosphere, and to find ways to use these waves as a “global sensor” to detect…