by Juan José Abad · Círculo de Amigos de la Historia. · tapa dura · ISBN 9788422501572
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«La tierra ¿planeta experimental para los extraterrestres?» is the science fiction essay by Juan José Abad, in hardcover from Círculo de Amigos de la Historia.
The author starts from the hypothesis that Earth could have been an experimental planet for extraterrestrial civilizations and reviews theories and alleged evidence of their intervention in the past. The volume combines popular science and speculation to question the origin of humanity, the enigmas of ancient civilizations, and the planet's place in the universe.
Volume III of the collection 'Los enigmas de las civilizaciones extra-terrestres', published by Círculo de Amigos de la Historia in 1977, in Spanish.
For readers curious about theories on extraterrestrial life and the mysteries of ancient civilizations.
