Zahnle K
NASA Ames Research Center, Moffett Field, California 94035-1000, USA.
Nature. 2001 Jul 12;412(6843):209-13. doi: 10.1038/35084148.
"Are they worlds, or are they mere masses of matter? Are physical forces alone at work there or has evolution begotten something more complex, something not unakin to what we know on Earth as life? It is in this that lies the peculiar interest of Mars." Percival Lowell (in ref. 1, p. 3)
“它们是一个个世界，还是仅仅是物质团块？那里只有物理力量在起作用，还是进化产生了更复杂的东西，某种与我们在地球上所知的生命并非毫无相似之处的东西？这正是火星的独特魅力所在。” 珀西瓦尔·洛厄尔（引自参考文献1，第3页）
