THE PLANET EARTH

Jun 30th, 2015
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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

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LECTURE 2THE PLANET EARTHTHE FORMATION OF THE EARTH WAS AN OFFSHOOT OF THE FORMATION OF THE UNIVERSEFormation of the Universe: Big Bang TheoryFormation of the Solar System: Nebular HypothesisTHE BIG BANG THEORYcontends that the Universe originated from a cosmic explosion (origin unknown) that hurled matter in all directions 15 and 20 billion years agofirst proposed by the Belgian priest Georges Lematre in the 1920s Edwin Hubble justified Lematres theory through observations that the Universe is continuously expanding; galaxies are moving away from each other*Redshift (universe expanding)Evidence: Every color has a wavelength (violet-shortest, red-longest), wavelength tends to emit the red light as it moves farther*nebula matter before big bangTHE SOLAR SYSTEM: leftover from the Big Bangthe sunthe planetsthe satellites and ringscomets and asteroidsmeteoroids and dustCOMPOSITION OF THE SOLAR SYSTEM BY MASSOBJECTPERCENTAGE OF MASSSun99.85%Jupiter0.10%all other planets0.04%comets0.01% (?)satellites and rings0.00%asteroids0.00%meteoroids and dust0.0000001% (?)THE NEBULAR HYPOTHESISthe solar system originated from a single rotating cloud of gas and dust, starting 4.6 billion years ago, which contracted due to gravitythe idea was first proposed by Immanuel Kant and Pierre Simon de Laplace in the 18th centuryTHE NEBULAR MODELTime 1: The Big Bang produced enormous amount of matter: rotating cloud of gas and dust. Time 2:

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