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[27] W.David Compton and Charles D.Benson，Living and Working in Space：A History of Skylab （Washington，DC：NASA 1983），271.
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[28] Compton and Benson，Living and Working in Space ，324.
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[29] Paul Martin，“Extending the Operational Life of the International Space Station Until 2024，” NASA Office of Inspector General，Audit Report，IG-14-031，September 18，2014.
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[30] Jeff Foust，“NASA Sees Strong International Interest in Lunar Exploration Plans，” Space News ，March 6，2018，http：//spacenews.com/nasa-sees-strong-international-interest-in-lunar-exploration-plans.
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[31] Robert M.Lightfoot Jr.，“Return to the Moon：A Partnership of Government，Academia，and Industry，” symposium，Washington，DC，March 28，2018.
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[32] Eric Berger，“Former NASA Administrator Says Lunar Gateway Is‘a Stupid Architecture，’” Ars Technica ，November 15，2018，https：//arstechnica.com/science/2018/11/former-nasa-administrator-says-lunar-gateway-is-a-stupid-architecture.
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[33] Mike Eckel，“First Female Space Tourist Blasts Off，” Associated Press，September 18，2006，http：//news.yahoo.com/s/ap/20060918/ap_on_sc/russia_space.
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[34] Jeff Foust，“NASA Tries to Commercialize the ISS，Again，” Space Review ，June 10，2019，http：//www.thespacereview.com/article/3731/1.
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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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[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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[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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