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The Mars Geyser Hopper (MGH) is a NASA design reference mission for a Discovery-class spacecraft concept that would investigate the springtime carbon dioxide Martian geysers found in regions around the south pole of Mars. There was some speculation in 2012 that the Geyser hopper mission could be flown after the InSight Mars lander. The power technology that MGH planned to use was the ASRG.〔()〕 NASA finished the ASRG design and made one test unit of the device but the program was concluded by the mid-2010s.〔(Stirling Converter Technology ). NASA, 2014〕〔(Closing out the ASRG program ). Author: Casey Dreier. 23 January 2014.〕 Neither InSight nor any of the next Discovery's semi-finalists use the ASRG or an RTG due to high demand and limited supply of the type of plutonium it relies on.〔 ==Background== The Discovery program was started in the 1990s following discussions at NASA for a new program, and has achieved such missions as ''Genesis'', ''Deep Impact'' and ''Kepler'' among others; this is the program this mission was designed for selection in, at least initially.〔()〕 One of the first unmanned robotic spacecraft to do a hop was Surveyor 6 lunar lander, which successfully aoft landed on the Moon 1967 and conducted a post-landing hop.〔 Another possibly for a hopper mission may be Saturn's moon Enceladeus.〔(BBC Enceladus named sweetest spot for alien life )〕 Hoppers are noted for their ability to potentially visit different landing sites.〔 Another hopper-type mission was the Comet Hopper, which won a Discovery semi-finalist award to study a hopping mission to the Comet 46P/Wirtanen.〔(http://www.nasa.gov/centers/goddard/news/releases/2011/11-033.html NASA Goddard Managed Comet Hopper Mission Selected for Further Study )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mars Geyser Hopper」の詳細全文を読む スポンサード リンク
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