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

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Unformatted text preview: Chapter 2 The Planet Earth Geology 11 – Principles of Geology A. M. P. Tengonciang National Institute of Geological Sciences University of the Philippines, Diliman 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 2.1 The origin of the Earth2....
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chap02 - Chapter 2 The Planet Earth Geology 11 –...

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