Mysterious sounds in stratosphere can’t be traced to any known source
High up in the stratosphere, there are strange sounds Shutterstock/Chaleephoto Solar-powered balloons floating in the stratosphere have recorded low-frequency sounds of mysterious origin. “When we started flying balloons years ago, we didn’t really know what we’d hear,” says Daniel Bowman at Sandia National Laboratories in New Mexico. “We learned how to identify sounds from explosions, meteor … Read more