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chap02 - Chapter 2 The Planet Earth Geology 11 Principles...

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Chapter 2 The Planet Earth Geology 11 – Principles of Geology A. M. P. Tengonciang National Institute of Geological Sciences University of the Philippines, Diliman
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2.1 The origin of the Earth Thomas Wright (1750) An Original Theory or New Hypothesis of the Universe the Milky Way is a slab of stars shaped like a mill-wheel with the Sun lying between the two planes, though not necessarily at the hub there might be other collections of stars (external galaxies) like the Milky Way, citing "the many cloudy spots” or nebulae Nebula (Gr. nephos “cloud” – gas & dust cloud in interstellar space) Immanuel Kant (1755) Universal Natural History and Theory of the Heavens the Milky Way was an optical effect due to our location within a large disk of stars, and that the fuzzy patches known as nebulas were other Milky Ways (external galaxies) By 1775, had put forth an early version of the nebular hypothesis Pierre Laplace (1796) – developed Kant’s version into the currently-accepted theory of how the solar system formed the solar system originated out of a gradually cooling cloud of gas, with the planets most remote from the center condensing first implies that cloud-covered Venus may be an immature version of the Earth, and that farther planets like Mars are more evolved suggests that planets are the natural consequence of the evolution of stars
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2.1 The origin of the Earth
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