Unexplained, eerie sounds detected in Earth's atmosphere by balloon sensors.
Scientists have recorded eerie sounds in Earth's stratosphere using hot air balloons fitted with microbarometers. The sounds, which repeat a few times per hour, are in the infrasound range and have unknown origins. The balloons, made from common materials, can soar around 70,000 feet over Earth and could potentially be used for more complex missions in the future. The researchers plan to continue investigating the collected data to determine the source of the mysterious noises.