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[8] 未来学家说,在轨道环上生活,在木星上开采氢来推动聚变经济。这些都很吸引人而且可行,但都是几个世纪以后的事情。
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[9] Robert Zubrin,The Case for Space:How the Revolution in Spaceflight Opens Up a Future of Limitless Possibility (New York:Prometheus Books,2019),166.
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[10] Zubrin,Case for Space ,166.
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[11] John M.Wahr et al.,“Tides on Europa,and the Thickness of Europa’s Icy Shell,” Journal of Geophysical Research 111(2006):12005-12014,doi:10.1029/2006JE002729.
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[12] Zubrin,Case for Space ,166.
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[13] Zubrin,Case for Space ,166.
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[15] J.Hunter Waite et al.,“Cassini Finds Molecular Hydrogen in the Enceladus Plume:Evidence for Hydrothermal Processes,” Science 356(2017):155-159,doi:10.1126/science.aai8703.
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[16] Charles Wohlforth and Amanda R.Hendrix,Beyond Earth:Our Path to a New Home in the Planets (New York:Pantheon,2016).
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[17] “惠更斯号”在降落到土卫六之前,搭载在NASA“卡西尼号”探测器上。
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[18] 自我提示:在21世纪末,也就是我们到达土卫六之前,将“飞行车”这个词注册商标。
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[19] James Stevenson et al.,“Membrane Alternatives in Worlds without Oxygen:Creation of an Azotosome,” Science Advances 1(2015),1:e1400067,doi:10.1126/sciadv.1400067.
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[20] Isaac Arthur,“Outward Bound:Colonizing Titan,” Science & Futurism with Isaac Arthur ,October 12,2017,https://www.youtube.com/watch?v=HdpRxGjtCo0&vl=en.
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[21] 请注意,上传你的大脑是复制—粘贴,而不是剪切—粘贴,所以会有两个你(所以你可以生活在土卫六上,探索外太阳系)。
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[22] Terry A.Hurford et al.,“Triton’s Fractures as Evidence for a Subsurface Ocean,” 48th Lunar and Planetary Science Conference,March 20-24,2017,The Woodlands,Texas,https://www.hou.usra.edu/meetings/lpsc2017/pdf/2376.pdf.
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[23] 2006年国际天文学联合会第26届大会第5A号决议。
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[24] S.Alan Stern,“The Pluto System:Initial Results from Its Exploration by New Horizons,” Science 350(2015):292,doi:10.1126/science.aad1815.
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[25] Leonid Marochnik et al.,“Estimates of Mass and Angular Momentum in the Oort Cloud,” Science 242(1988):547-550,doi:10.1126/science.242.4878.547.
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[26] “How Do We Know When Voyager Reaches Interstellar Space?” NASA fact sheet 2013-278,September 12,2013,https://www.nasa.gov/mission_pages/voyager/voyager20130912f.html.
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[27] Isaac Arthur,“Outward Bound:Colonizing the Oort Cloud,” Science and Futurism with Isaac Arthur ,December 14,2017,https://www.youtube.com/watch?v=H8Bx7y0syxc.
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[28] Andrew V.Ilin et al.,“VASIMR® Human Mission to Mars,” Space,Propulsion & Energy Sciences International Forum,March 15-17,2011,University of Maryland,College Park,MD,http://www.adastrarocket.com/Andrew-SPESIF-2011.pdf.
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[29] Martin Tajmar et al.,“The SpaceDrive Project—First Results on EMDrive and Mach-Effect Thrusters,” presented at the Space Propulsion Conference in Seville,Spain,May 14-18,2018,https://www.researchgate.net/publication/325177082_The_SpaceDrive_Project_-_First_Results_on_EMDrive_and_Mach-Effect_Thrusters.
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[30] Gregory L.Matloff et al.,“The Beryllium Hollow-Body Solar Sail:Exploration of the Sun’s Gravitational Focus and the Inner Oort Cloud,” Cornell University Physics,September 20,2008,arXiv:0809.3535.
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