The unknown crackling could be the sound of distant thunderstorms, falling meteors, or turbulence. Listen to the sounds a balloon hears 12 miles above Earth: from ocean waves to volcanic eruptions.

Up, up in the air ... scientific solar-powered balloons have recorded some strange sounds in the stratosphere researchers cannot identify. Daniel Bowman and other researchers at Sandia National ...

Hot air balloons launched by scientists have recorded mysterious sounds of “completely unknown” origin, high in the Earth’s atmosphere. Large 6-7-metre-long balloons were sent to the stratosphere – ...

Intrepid explorers braved the unknown to find that the world is round. Now, a detector suspended from a balloon circling the frigid Antarctic has measured the curvature of the universe and revealed ...

Daniel Bowman sends cell phones into the stratosphere aboard solar-powered hot-air balloons. You might be surprised what sounds they record up there. These balloons listen to the Earth from a dozen ...