Between 30 and 60 miles above Earth’s surface lies a largely unstudied stretch of the atmosphere. It’s too high for airplanes and weather balloons, too low for satellites and nearly impossible to ...
Each day, radio signals from key communications and navigation satellites travel freely through a layer of Earth’s atmosphere known as the ionosphere. Floating 50 to 400 miles (80 to 643 kilometers) ...
"The phenomenon is highly repeatable. We discovered an unplanned new technique for identifying objects entering the earth's atmosphere." Researchers with the U.S. military's Defense Advanced Research ...
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