by Juan José Abad · tapa dura · ISBN 9788422501565
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«La tierra ¿planeta experimental para los extraterrestres?» is the essay by Juan José Abad in hardback, published by Círculo de Amigos de la Historia.
The author puts forward the hypothesis that Earth could be an experimental planet used by extraterrestrial civilisations. With a popular-science approach, it reviews theories about life on other worlds, the search for intelligent signals and the possible visit of beings from other planets, and includes the question of UFO phenomena.
Work in Spanish of 262 pages published in 1978; third volume of the collection «Los enigmas de las civilizaciones extra-terrestres».
For readers interested in mystery, astronomy and UFO phenomena who are looking for a popular-science work from the late 1970s.
