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Galaxy (spacecraft)
''Galaxy'' (previously ''Guardian'') is a canceled prototype space habitat designed by the American firm Bigelow Aerospace, and was intended to be the third spacecraft launched by the company in their efforts to create a commercial space station. Like other modules made by Bigelow Aerospace, ''Galaxy'' is based on the inflatable TransHab design by NASA, and was to be used for advanced systems testing before the company launched human-rated vehicles.
== Spacecraft history ==
''Galaxy'' started life as twin spacecraft named ''Guardian'' which would have acted as 45% scale intermediates between the one-third size ''Genesis I'' & ''Genesis II'' pathfinders and the full size ''BA 330'' man-rated module.〔 Sometime after 2004, the two ''Guardian'' flights were split into the ''Galaxy'' module and larger ''Sundancer'' module, each testing progressively advanced systems. This ''Galaxy'' had twice the interior volume of the ''Genesis'' craft: .〔 In 2007, the parameters for ''Galaxy'' were again modified, with final specifications being for a spacecraft in length, in diameter and with of interior volume—45% greater than the ''Genesis'' modules. It was intended for launch in late 2008.〔〔
In August 2007, however, Bigelow Aerospace announced that due to rising launch costs (stated as three times more expensive than for previous launches〔) and the successful ''Genesis'' missions, the ''Galaxy'' spacecraft would not be launched. Instead, many of the module's systems—possibly the entire craft—would be constructed and ground tested, allowing Bigelow employees to gain further experience and potentially advance ''Sundancer'''s schedule.〔
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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