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High-altitude balloon
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High-altitude balloon : ウィキペディア英語版
High-altitude balloon

High-altitude balloons are unmanned balloons, usually filled with helium or hydrogen, that are released into the stratosphere, generally attaining between . During 2002, a balloon named BU60-1 attained .〔(【引用サイトリンク】 Research on Balloon to Float over 50km Altitude )
The most common type of high altitude balloons are weather balloons. Other purposes include use as a platform for experiments in the upper atmosphere. Modern balloons generally contain electronic equipment such as radio transmitters, cameras, or satellite navigation systems, such as GPS receivers.
These balloons are launched into what is termed "near space"—- the area of Earth's atmosphere where there is very little air, but where the remaining amount generates too much drag for satellites to remain in orbit.
Due to the low cost of GPS and communications equipment, high altitude ballooning is a popular hobby, with organizations such as UKHAS assisting the development of payloads.〔("DIY balloon sent up 30km" ) Boing Boing dated 26 October 2007. Recovered on 8 June 2008〕〔McDermott, Vincent. ("Space race for DIYers" ) National Post dated 30 April 2011. Recovered on 28 December 2011〕
==History==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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