Micah Hanks at Mysterious Universe:
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The concept of alien life visiting Earth, particularly in ancient times to plant the seeds of knowledge amidst early human minds, has gone through a renaissance over the last few years. Every few decades, trends (including this one) will appear to go through short little bursts of revitalization, almost like mystery signals leaping from the otherwise desolate void of space, and calling to us with promises of things greater and more distant than ourselves or the knowledge we have attained.
While the concept of “ancient aliens” has been entertained by some of the brightest minds, the concept is generally attributed to–of all people–Carl Sagan, who posited as early as 1966 that what he called paleo-contact might account for knowledge brought to Earth by extraterrestrials, in a book he coauthored with astrophysicist I.S. Shklovski called Intelligent Life in the Universe. Earlier roots predating Sagan and Shklovski’s writing have been linked to H.