11 - Lecture 6 1/31/11 Gravitational Collapse The solar...

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Lecture 6 1/31/11 Gravitational Collapse The solar nebula was initially somewhat spherical and a few light years in diameter. Very cold Rotating slightly It was given a “push” by some event perhaps the shock wave from a nearby supernova As the nebula shrank, gravity increased, causing cllapse As the nebula “falls” inward, gravitational potential energy is converted to heat. Conservation of Energy As the nebula's radius decreases, it rotates faster Conservation of Angular Momentum ? What is gravitational potential energy? Stored energy What is convervation of energy? Energy is never lost just transfered/changed What is conservation of angular momentum? Angular momentum = mass x velocity x radius Flattening of the Solar Nebula Their random velocities average out into the nebula's direction of rotation The spinning nebula assumes the shape of a disk
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As the neubla collapses, it heats up, spins faster, and flattens Orderly Motions in the Solar System The Sun formed in the very center of the nebula. The planets formed in the rest of the disk.
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This note was uploaded on 03/14/2011 for the course ASTRO 115 taught by Professor Bergins during the Winter '11 term at University of Michigan.

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11 - Lecture 6 1/31/11 Gravitational Collapse The solar...

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