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2_The Planet Earth

2_The Planet Earth - LECTURE 2 THE PLANET EARTH THE...

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LECTURE 2 THE PLANET EARTH THE FORMATION OF THE EARTH WAS AN OFFSHOOT OF THE FORMATION OF THE UNIVERSE Formation of the Universe: Big Bang Theory Formation of the Solar System: Nebular Hypothesis THE BIG BANG THEORY - contends that the Universe originated from a cosmic explosion (origin unknown) that hurled matter in all directions 15 and 20 billion years ago - first proposed by the Belgian priest Georges Lemaître in the 1920s - Edwin Hubble justified Lemaître’s theory through observations that the Universe is continuously expanding; galaxies are moving away from each other THE SOLAR SYSTEM: leftover from the Big Bang the sun the planets the satellites and rings comets and asteroids meteoroids and dust COMPOSITION OF THE SOLAR SYSTEM BY MASS OBJECT PERCENTAGE OF MASS Sun 99.85% Jupiter 0.10% all other planets 0.04% comets 0.01% (?) satellites and rings 0.00% asteroids 0.00% meteoroids and dust 0.0000001% (?) THE NEBULAR HYPOTHESIS - the solar system originated from a single rotating cloud of gas and dust, starting 4.6 billion years ago, which contracted due to gravity - the idea was first proposed by Immanuel Kant and Pierre Simon de Laplace in the 18th century THE NEBULAR MODEL Time 1: The Big Bang produced enormous amount of matter: rotating cloud of gas and dust.
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Time 2: The rotating gas-dust cloud began to contract due to gravity. Most of the mass became concentrated at the center, forming the SUN.
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