8 results about "High-altitude balloon" patented technology

High-altitude balloons are manned or unmanned balloons, usually filled with helium or hydrogen, or in some cases methane, that are released into the stratosphere, generally attaining between 18 and 37 km (11 and 23 mi; 59,000 and 121,000 ft) above sea level. In 2002, a balloon named BU60-1 reached a record altitude of 53.0 km (32.9 mi; 173,900 ft).