Notes

Slide Show

Outline

1	Chapter 6 Our Solar System and Its Origin
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5	The Origins of the Solar System: Four Challenges
6	Challenge 1: Patterns of Motion All planets orbit the Sun in the same direction --- counterclockwise when seen from high above the Earth’s North Pole. All planetary orbits lie nearly in the same plane. Almost all planets travel on nearly circular orbits, and the spacing between planetary orbits increases with distance from the Sun according to a fairly regular trend.
7	Challenge 1: Patterns of Motion - Continued
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10	Challenge 2
11	Challenge 3
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13	"The Third Challenge for any..." The Third Challenge for any theory of solar system formation is to explain the existence and general properties of the large numbers of asteroids and comets. Why are there so many? How did their existence come about?
14	Challenge 4: Exceptions to the Rule
15	Four Major Characteristics of the Solar System Large bodies in the solar system have orderly motions. Planets fall into two main categories: Small, rocky terrestrial planets. Large, hydrogen rich gas giants (Jovian planets). Several notable exceptions to these general trends stand out: Planets with unusual axial tilts or surrounding large moons. Moons with unusual orbits.
16	The Nebular Theory
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18	What evidence is there in support of the Nebular Theory?
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22	Building The Planets
23	The Ingredients of the Solar Nebula Fell Into Four Categories Based on Their Condensation Temperatures:
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27	Accretion: Assembling the Planetesimals
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31	Nebular Capture: Making the Jovian Planets
32	The Solar Wind: Clearing Away the Nebula
33	Leftover Planetesimals
34	The Early Bombardment: A Rain of Rock and Ice
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36	Captured Moons
37	The two moons of Mars are probably captured satellites.
38	Giant Impacts and the Formation of Our Moon.
39	Earth Impact with Mars sized Planetesimal
40	Summary: Meeting the Challenges
41	Other Planetary Systems
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44	End of Section