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NASA reveals Mars image that some claim is an alien city - Daily Mail
URL: http://www.dailymail.co.uk/sciencetech/article-4419502/NASA-reveals-Mars-image-claim-alien-city.html
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Submitted: Tue Apr 18 2017
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CT: UFOSeek News 2015: NASA reveals Mars image that some claim is an alien city - Daily Mail
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Although the American space agency has suggested the layered mesa is probably comprised of sedimentary deposits that are being exhumed as it erodes, skeptics have claimed it is a 'ventilation roof of an underground city' built by aliens.