Hollow Earth Theory
The first scientist to say the probable existence of an empty space inside the planet was Edmond Halley (1656-1742), the well-known who discovered the comet. According to its terrestrial electromagnetism studies, the Earth had to be hollow, and inside it had to find another incandescent globe, a nucleus capable as another sun to illuminate the underworld. This theory was hotly contested, but others continued the Halley studies, such as Leonardo Euler (1707-1783), his most influential follower. A few years later, a great contribution to this theory was made by John Cleves Symmes (1780-1829), who volunteered to empirically prove the reality of the phenomenon, declaring himself ready to take a trip to the North Pole, which would lead in the cavity of the Earth . He was never taken seriously and was reduced to write a novel, Symzonia, in which he described the hypothetical journey of Captain Adam Seaborn at the center of the Earth. Here, Seaborn discovered the existence of a world q...