Chapter 8

Chapter 8 - Chapter 8 Any model of solar system origins...

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Chapter 8 Any model of solar system origins must explain the present-day Sun and planets The cosmic abundances of the chemical elements are the result of how stars evolve The terrestrial planets are small because they are made of less abundant elements. 3 Key Properties of Our Solar System: 1.) terrestrial planets, composed of rocky substances, are relatively small, while Jovian 2.) all of the planets orbit the Sun in the same direction, and all of their orbits are in nearly the same plane 3.) the terrestrial planets orbit close to the sun, while Jovian planets orbit far from it. Big Bang only had small elements. Stars, either by thermonuclear fusion reaction or by violent explosions, created the heavier elements. nebulosity - stars eject matter when they die which is how Earth gets these elements. interstellar medium – tenuous collection of gas and dust that pervades the spaces between the stars New stars form from heavy elements of old ones which develop into a system of planets, satellites, comets & asteroids. It is “recycled” material. Because heavier elements required to make a terrestrial planet are rare, only relatively small planets can form out of them. By contrast, hydrogen & helium are so abundant that it was possible for these elements to form large Jovian planets. The abundances of radioactive elements reveal the solar system’s age
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Chapter 8 - Chapter 8 Any model of solar system origins...

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