"Athanasius Kircher (1602–1680), a Jesuit scholar and polymath, described in his book, Mundus Subterraneus, the interior of the Earth. He postulated a huge fire in the center of the Earth, feeding numerous smaller fire seats in the mantle. These fires were connected with the central fire and interconnected through a system of channels. Some of these channels reached the surface of the Earth, feeding volcanoes. ..." – By H. Palme
"The uppermost layers of a planetary atmosphere, where the density of neutral particles is vanishingly low, are commonly called exosphere or planetary corona. Since the atmosphere is not completely bound to the planet by the planetary gravitational field, light atoms, such as hydrogen and helium, with sufficiently large thermal velocities can escape from the upper atmosphere into interplanetary space. ..." – By Valery I. Shematovich and Dmitry V. Bisikalo
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