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[35] Eric Niiler，“Who’s Going to Buy the International Space Station？” Wired ，February 12，2018，https：//www.wired.com/story/whos-going-to-buy-the-international-space-station.
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[36] Erin Mahoney，ed.，“First Year of BEAM Demo Offers Valuable Data on Expandable Habitats，” NASA，May 26，2017，https：//www.nasa.gov/feature/first-year-of-beam-demo-offers-valuable-data-on-expandable-habitats.
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[37] Dan Schrimpsher，“Interview：TransHab Developer William Schneider，” Space Review ，August 21，2006，http：//www.thespacereview.com/article/686/1.
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[38] Schrimpsher，“Interview.”
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[39] Lara Logan（correspondent），interview with Robert Bigelow. 60 Minutes ，May 28，2017，https：//www.cbsnews.com/news/bigelow-aerospace-founder-says-commercial-world-will-lead-in-space/.
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[40] Robert Bigelow，“Public-Private Partnerships in Lunar Enterprises—No Time To Lose，” presentation at the 2017 ISS R&D Conference，July 21，2017，https：//youtu.be/5403y2izgOo.
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[41] Paul Brians，“The Day They Tested the Rec Room，” Co Evolution Quarterly （Summer 1981），116-124.
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[42] 以下简称超燃冲压发动机。——译注
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[43] “Reaction Engines Secures Funding to Enable Development of SABRE Demonstrator Engine，” Reaction Engines Limited press release，July 12，2016，https：//www.reactionengines.co.uk/news/reaction-engines-secures-funding-to-enable-development-of-sabre-demonstrator-engine；“Reaction Engines Awarded DARPA Contract to Perform High-Temperature Testing of the SABRE Precooler，” Reaction Engines Limited press release，September 25，2017，https：//www.reactionengines.co.uk/news/reaction-engines-awarded-darpa-contract-to-perform-high-temperature-testing-of-the-sabre-precooler.
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[44] Mike Wall，“Ticket Price for Private Spaceflights on Virgin Galactic’s SpaceShipTwo Going Up，” Space ，April 30，2013，https：//www.space.com/20886-virgin-galactic-spaceshiptwo-ticket-prices.html.
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[45] 到2021年6月，该计划还未成功。——译注
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[46] Jeff Foust，“Still Waiting on Space Tourism after All These Years，” Space Review ，June 18，2018，http：//www.thespacereview.com/article/3516/1.
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[47] Federal Register，vol.71，no.241，December 15，2006，p.75616.
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[48] William M.Leary，“Robert Fulton’s Skyhook and Operation Coldfeet，” Center for the Study of Intelligence，Central Intelligence Agency，June 27，2008，https：//www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/csi-studies/studies/95unclass/Leary.html.
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[49] Thomas Bogar et al.，“Hypersonic Airplane Space Tether Orbital Launch System，” NASA Institute for Advanced Concepts Research，Grant No.07600-018，Phase I Final Report，http：//images.spaceref.com/docs/spaceelevator/355Bogar.pdf.
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[50] John E.Grant，“Hypersonic Airplane Space Tether Orbital Launch—HASTOL，” NASA Institute for Advanced Concepts 3rd Annual Meeting，NASA Ames Research Center，San Jose，California，June 6，2001，http：//www.niac.usra.edu/files/library/meetings/annual/jun01/391Grant.pdf.
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[51] Chia-Chi Chang et al.，“A New Lower Limit for the Ultimate Breaking Strain of Carbon Nanotubes，” ACS Nano 4（2010）：5095-5100，doi：10.1021/nn100946q.
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[52] Paul Birch，“Orbital Ring Systems and Jacob’s Ladders—Ⅱ，” Journal of the British Interplanetary Society 36（1983）：231-238.
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[53] 太空中的太阳能电池板比地球上的效率大约高7倍，因为它们可以持续暴露在阳光下，但将能量向地球传输确实引起了人们对人类和野生动物安全的担忧。
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[54] Doris Elin Salazar，“This Giant，Ultrathin NASA Balloon Just Broke an Altitude Record，” Space ，September 12，2018，https：//www.space.com/41791-giant-nasa-balloon-big-60-breaks-record.html.
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太空居民：人类将如何在无垠宇宙中定居 4 生活在月球
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1969年7月20日，美国成功地将两名宇航员送上了月球。在接下来的三年里，又有十多名美国宇航员登上了月球。有的宇航员在月球上开小车，有的宇航员采集岩石样本。还有一位宇航员打了高尔夫球，尽管他连果岭在哪儿都没找到。然后就完了。1972年12月14日，宇航员哈里森·施密特和尤金·塞尔南（Eugene Cernan）在月球表面待了三天后离开月球。从那以后，再也没有人回去过。
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我们离开月球的原因有很多。如前所述，主要原因是考虑到费用，没有令人信服的理由登上月球。当然，最初登上月球的原因，首先是因为美国与苏联处于战争状态——一场政治哲学的战争，以及代理人军队间从20世纪40年代末开始在全球范围内进行的肉搏战。1957年10月4日，苏联将“斯普特尼克1号”人造卫星送入椭圆形近地轨道。
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