Summary Chapter 19

Summary Chapter 19 - Chapter Summary Chapter 19: The Origin...

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Chapter Summary Chapter 19: The Origin of the Solar System 1. Observations to be explained The large bodies orbit in same direction and plane There are two types of planets: terrestrial and jovian There are smaller bodies: asteroids and comets Notable exceptions to usual patterns: odd tilt of Uranus, size of Earth’s moon, Venus’ retrograde rotation 2. Solar System creation Nebular Theory – Solar System formation: Collapsing cloud Rotation of the cloud increased as the cloud contracted (conservation of angular momentum) Collisions between particles in the cloud caused flatten into a disk (gas particles colliding reduce up and down motions) Spinning cloud flattens as it shrinks 3. Formation of planets Gravity causes cloud to contract and it heats up (conservation of energy) Frost line (also known as snow line) Inside: Too hot for hydrogen compounds to form ices Outside: Cold enough for ices to form Planetesimal accretion 2 scenarios for planetary formation: core accretion (the more acceptable theory)
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Summary Chapter 19 - Chapter Summary Chapter 19: The Origin...

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