Lecture27_Chapter39 [F2008)

Lecture27_Chapter39 [F2008) - Plan Lecture28: Chapter 39...

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1 Lecture28: Chapter 39 The Solar System Plan ± How the Solar System was Formed? ² Planets of the Solar System ² Asteroids, Meteoroids, and Comets Home Work: ± Chapter 39 ± Key Terms ± Review questions:3,4, 8, 10, 13, 15, 16, 20 How was the solar system formed? The sun was formed from the gravitational contraction of interstellar matter about 5 billion years ago. During contraction, the gravitational potential energy of the matter transforms into 1. thermal energy of matter, and 2. rotational energy of the matter
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2 Thermal energy created a hot dense center – the sun. Rotational motion speeds up and flattens the matter into a disk shape. The increased surface area of the flattened disk radiates more of its energy into space . The disk cools. The cooling led to the condensation of matter in swirling eddies – the birthplace of the planets. The solar system Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto ? Is Pluto a Planet? ± The International Astronomical Union (IAU) in 2006, admitted new definition of all celestial bodies. ± New definition states that all true
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Lecture27_Chapter39 [F2008) - Plan Lecture28: Chapter 39...

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