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[19] Schmitt，Return to the Moon.
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[20] Ian A.Crawford，“Lunar Resources：A Review，” Progress in Physical Geography：Earth and Environment 39（2015）：137-167，doi：10.1177/0309133314567585.
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[21] Amanda Kay，“Rare Earths Production：8 Top Countries，” Investing News ，April 3，2018，https：//investingnews.com/daily/resource-investing/critical-metals-investing/rare-earth-investing/rare-earth-producing-countries.
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[22] Angel Abbud-Madrid，private communication，Return to the Moon symposium，March 28，2018.
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[23] Alex Freundlich et al.，“Manufacture of Solar Cells on the Moon，” Conference Record of the Thirty-First IEEE Photovoltaic Specialists Conference，2005，doi：10.1109/PVSC.2005.1488252.
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[24] David Biello，“Where Did the Carter White House’s Solar Panels Go？” Scientific American ，August 6，2010，https：//www.scientificamerican.com/article/carter-white-house-solar-panel-array.
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[25] 一个次要障碍是如何安全地将能量用波束发送给收集器。这种技术看似可行但未经商业规模化测试。
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[26] LUCA：大声，不友好的反驳。
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[27] Haym Benaroya et al.，“Engineering，Design and Construction of Lunar Bases，” Journal of Aerospace Engineering 15（2002）：33-45.
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[28] 这个厚度只适合短期停留，完全保护则需要覆盖超过5米厚的土壤。
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[29] 我不应该摆出一副满不在乎的样子。月震并不罕见，尤其是每天早晨当太阳温暖月壳时，就会引起热震。
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[30] ESA的“月球村”方案经常被误解为在月球上建造一个村庄。但ESA设想的“村庄”是地球上的科学家和工程师聚集在一起分享想法，使月球定居点成为现实的一个社区。
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[31] Benaroya et al.，“Engineering.”
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[32] Kenneth Chang，“NASA Reports a Moon Oasis，Just a Little Bit Wetter Than the Sahara” New York Times ，October 22，2010，A20.
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[33] Li et al.，“Direct Evidence.”
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[34] Crawford，“Lunar Resources，” 167.
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[35] Cheryl Lynn York et al.，“Lunar Lava Tube Sensing，” Lunar and Planetary Institute，Joint Workshop on New Technologies for Lunar Resource Assessment，1992，https：//www.lpi.usra.edu/lpi/contribution_docs/TR/TR_9206.pdf.
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[36] Tetsuya Kaku et al.，“Detection of Intact Lava Tubes at Marius Hills on the Moon by SELENE（Kaguya）Lunar Radar Sounder，” Geophysical Research Letters 44（2017）：10，155-10，161，doi：10.1002/2017GL074998.
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[37] Werner Grandl，“Human Life in the Solar System，” REACH 5（2017）：9-21，doi：10.1016/j.reach.2017.03.001.
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[38] Junichi Haruyama et al.，“Lunar Holes and Lava Tubes as Resources for Lunar Science and Exploration，” in Moon—Prospective Energy and Material Resources ，ed. Viorel Badescu（Springer，2012），139-163.
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[39] Gerald B.Sanders and William E.Larson，“Progress Made in Lunar In Situ Resource Utilization under NASA’s Exploration Technology and Development Program，” Journal of Aerospace Engineering 26（2013），doi：10.1061/（ASCE）AS.1943-5525.0000208.
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[40] “NASA’s Analog Missions：Paving the Way for Space Exploration，” NASA fact sheet，NP-2011-06-395-LaRC，2011，https：//www.lpi.usra.edu/lunar/strategies/NASA-Analog-Missions-NP-2011-06-395.pdf.
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[41] Kenneth Chang，“Meet SpaceX’s First Moon Voyage Customer，Yusaku Maezawa，” New York Times ，September 12，2018，B4.
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[42] Rachel Caston et al.，“Assessing Toxicity and Nuclear and Mitochondrial DNA Damage Caused by Exposure of Mammalian Cells to Lunar Regolith Simulants，” Geo Health 2（2018）：139-148，doi：10.1002/2017GH000125.
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[43] “Apollo 17 Technical Crew Debriefing，” NASA，January 4，1973，http：//www.ccas.us/CCAS_NASA_PressKits/Apollo_Missions/Apollo17_TechnicalCrewDebriefing.pdf.
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