14-SolarSystem - OriginandEvolutionofthe...

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Origin and Evolution of the Solar System and its Worlds Biology 190A Lecture 14
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he The Solar System onsists of the Sun planets steroids comets and Consists of the Sun, planets, asteroids, comets and dust held in neighborhood by the Sun’s gravity erything goes around the Sun on elliptical Everything goes around the Sun on elliptical orbits —the Earth orbits at 1 Astronomical Unit (AU) Most orbits lie in the same plane, circling counter clockwise like peas rolling around on a dinner plate
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he lar stem The Solar System D Jupiter = 143,000 km 1 390 000 km D Sun = 1,390,000 km The Sun is >99% of the Solar System! D Earth = 12,800 km Jupiter’s mass > sum of everything smaller
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Solar Nebula Theory The Solar System originated from a rotating cloud of gas and dust. As it contracted, it flattened into a disk and began to spin faster (Conservation of Angular Momentum) The outer part of the disk becoming the planets, and the inner part becoming the Sun
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Condensation mperatures Temperatures Close to the center, where the temperature was ighest only silicates highest, only silicates and metals could condense Farther out, volatile gases could condense as well. These are much more abundant, so planets could grow p g larger there.
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e Inner Terrestrial Planets The Inner Terrestrial Planets Inner planets have high average densities V E M:54 53 55 39 kg/liter) (M,V,E,M: 5.4, 5.3, 5.5, 3.9 kg/liter) Mostly rock and iron Densities generally lower, farther out in Solar System Asteroids ~3 kg/liter
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Mercury, The Innermost Planet i f th lt Mercury is one of the least explored planets in the Solar t System More difficult to reach than to Sl St ! leave the Solar System! NASA’s MESSENGER will return ercury in 2011 to Mercury in 2011 Planet of Extremes On the dayside, T > 700K On the nightside, T < 70 K No atmosphere, heavily cratered
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Venus–Not Really Earth’s Twin Venus is nearly the same size as Earth, but that is where the resemblance stops.
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14-SolarSystem - OriginandEvolutionofthe...

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