The possibility that the Earth is hollow, it can get into it through North and South poles, and that secret civilizations flourish within it, has spurred the imaginations since time immemorial. Thus, the Babylonian hero Gilgamesh visited his ancestor Utnapishtim in the bowels of the earth, in Greek mythology, Orpheus tries to rescue Eurydice from hell underground, it was said that the Pharaohs of Egypt were connected with the underworld, which they agreed through secret tunnels hidden in the pyramids, and Buddhist believed (and still believe) that millions of people live in Agharta, an underground paradise ruled by the king of the world. The scientific world was not immune to this theory: Leonard Euler, a mathematical genius of the eighteenth century concluded that the Earth was hollow, containing a central sun and was inhabited, and Dr. Edmund Halley, discoverer of Comet Halley and Astronomer Royal England in the eighteenth century also believed that the Earth was hollow inside and contained three plants. None of these theories was supported scientifically, but alternated with various works of fiction on the same topic, the most important of which was The Adventures of Arthur Gordon Pym, Edgar Allan Poe (1833), in which the hero and his partner have a terrifying encounter with beings inside the Earth, and Journey to the Center of the Earth by Jules Verne (1864), in which an adventurous professor, his nephew and a guide enter the Earth's interior through an extinct volcano in Iceland, and find new skies, seas and gigantic prehistoric reptiles that abound in the forests.
The belief in a hollow earth was so widespread that even Edgar Rice Burroughs, the celeb
re author of Tarzan, felt compelled to write Tarzan in the bowels of the Earth (1929), in which the son of the famous jungle will Pellucidar, a world that is on the inside surface of the Earth that is lit by a central sun. The shadow beyond time (1936) of HP's famous Byrd expeditions first entered the hollow Earth controversy when several articles and books specially Worlds Beyond the Poles (Worlds beyond the Poles), the Amadeo Giannini sought Byrd had not actually flown over the Pole, but to within the large holes into the interior of the Earth. Ray Palmer, based primarily on Giannini's book, introduced this theory in the 1959 December issue of its magazine and, as a consequence, he maintained a voluminous correspondence Lovecraft transported about the matter at the time describing current and former underground race that dominated the Earth for 150 million years ago and that since then, the shelter of the inner Earth, has invented atomic planes and vehicles, and dominates the time travel and extrasensory perception. Could Earth be hollow? Again, the answer must be negative. Unlike what happened with the first hollow Earth theorists, physical properties and structure inside the Earth can now be measured accurately with seismographs and electronic computers. Far from being hollow, the Earth is composed of four main layers: the crust, mantle, core and the nucleolus. The crust of granite and basalt rock has a thickness of 30 to 40 km. (Much thinner in the trenches). Below the crust is the mantle, which extends down over 2 900 km., And is solid and composed of silicates of magnesium, iron, calcium and aluminum. And below that is the core, believed to be composed mainly of iron in the molten state.
Finally, at a depth of about 5,090 km. is the nucleolus, which may be solid as a result of freezing of iron under the extraordinary pressure of about 3,200,000 atmospheres. Although many details are only hypotheses pending the progress of science will allow us to confirm ..........
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