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Unformatted text preview: It was given a push by some event. perhaps the shock wave from a nearby supernova As the nebula shrank, gravity increased, causing collapse. As the nebula falls inward, gravitational potential energy is converted to heat. Conservation of Energy As the nebulas radius decreases, it rotates faster Conservation of Angular Momentum As the nebula collapses, clumps of gas collide & merge. Their random velocities average out into the nebulas direction of rotation. The spinning nebula assumes the shape of a disk. As the nebula collapses, it heats up, spins faster, and flattens...
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