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During the early years of spaceflight only nation states had the resources to develop and fly spacecraft. Both the U.S. space program and Soviet space program were operated using mainly military pilots as astronauts. During this period, no commercial space launches were available to private operators, and no private organization was able to offer space launches. In 1980s, the European Space Agency created Arianespace, the world's first commercial space transportation company, and, following the Challenger disaster, the American government deregulated the American space transportation market as well. In the 1990s the Russian government sold their majority stake in RSC Energia to private investors (although it has recently renationalized the Russian space sector in 2013–2014.〔 〕) These events for the first time allowed private organizations to purchase, develop and offer space launch services; beginning the period of private spaceflight in the late-1980s and early-1990s. The following is a list of non-government-owned spacecraft manufacturing companies and contractors. ==Satellite manufacturers== There are seven major companies that build large, commercial, Geosynchronous satellite platforms: In addition to those above, the following companies have successfully built and launched satellite platforms: 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「List of spacecraft manufacturers」の詳細全文を読む スポンサード リンク
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