Mysterious alien sounds have been captured at the edge of space for the first time in fifty years.
The eerie noises were recorded aboard a NASA student balloon experiment.
Hisses and whistles heard in recordings were captured 22 miles above Earth, by a student last year. The recording equipment was set up by a graduate student as part of a NASA project to record sound from the edges of the atmosphere.
Daniel Bowman, a graduate student at the University of North Carolina, designed and built the equipment according to a report from Live Science. The instruments eavesdropped on atmospheric infrasound, or sound waves at frequencies below 20 hertz. Infrasound is below human hearing range, but speeding up the recordings has made them audible.
Bowman said “It sounds kind of like ‘The X-Files,'”
NASA are unable to explain the noises and will launch another study later this year.
Capturing the eerie noises wasn’t exactly a simple task – it involved infrasound microphones dangling from a helium balloon which flew above the US states of New Mexico and Arizona last year. Launched on August 9, 2014, the flight was part of an annual project conducted by NASA and the Louisiana Space Consortium. Bowman’s experiment was one of 10 payloads flown as part of the High Altitude Student Platform (HASP) last year.
During its nine-hour flight, the balloon floated some 450 miles (725 km) and reached a height of more than 123,000 feet (37,500 meters). This is a distance of 62 miles (100 km) above the Earth’s surface – an area above where airplanes fly, but below the boundary which marks the top of the stratosphere. It was the first time an infrasound study has reached such heights.
The source of the noises, which were captured 22 miles above Earth, remain a mystery to scientists, though many have speculated about the cause.
Those speculations include ocean waves, gravity waves, clear air turbulence, noise from the balloon cable itself, and even a wind farm under the balloon’s path.
Natural occurrences such as storms and earthquakes can also cause infrasounds.
Regardless of the cause, the fact the recording exists is a big step forward, as it marks the first time acoustic recordings have taken place in the stratosphere in 50 years, according to Bowman.
Scientists are hoping more information will be revealed during this year’s HASP balloon launch, scheduled to take place this summer.
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