**'（，）是一位美国天文学家和天体物理学家，亚利桑那大学行星科学榮譽退休教授，专攻近地天体的危害。
参考文献
外部链接
*[https://web.archive.org/web/20130410235441/http://www.lpl.arizona.edu/people/faculty/lewis2.html John Lewis's web page] at the University of Arizona.
*[http://www.johnslewis.com/ Personal blog]
*[http://www.airspacemag.com/as-interview/extraterrestrial-commodities-market-180956240/?no-ist The Extraterrestrial Commodities Market] airspacemag.com
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