High-altitude balloon

（重定向自Stratospheric balloon）

An example image from a hobby high altitude balloon launched by the Make Stuff Club from Kalamazoo College

Photographed at approximately 100,000 ft (30,000 m) above Oregon using a 1,500 g (3.3 lb) weather balloon.

High-altitude balloons are unmanned balloons, usually filled with helium or hydrogen, that are released into the stratosphere, generally attaining between 60,000 to 120,000 feet (11 to 23 mi; 18 to 37 km). In 2002, a balloon named BU60-1 attained 53.0 km (32.9 mi; 173,900 ft).

单词	Stratospheric balloon
释义	Stratospheric balloon 英语百科 High-altitude balloon （重定向自Stratospheric balloon） High-altitude balloons are unmanned balloons, usually filled with helium or hydrogen, that are released into the stratosphere, generally attaining between 60,000 to 120,000 feet (11 to 23 mi; 18 to 37 km). In 2002, a balloon named BU60-1 attained 53.0 km (32.9 mi; 173,900 ft).
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