Bestselling Swiss author Erich von Daniken believed they were built by stranded extraterrestrials.
瑞士畅销书作家埃里希·冯·丹尼肯认为它们是由受困的外星人建造的。
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One answer appeared in 1969, when the German researcher and writer Erich von Daniken proposed that the lines were drawn by extraterrestrials as runways for their aircraft.
1969年，德国研究人员兼作家埃里希·冯·丹尼肯提出，这些线条是外星人为它们的飞机绘制的跑道。
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This prompted Erich von Daniken in his book Chariots of the Gods to suggest that they actually were runways for extraterrestrial craft.