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In different systems, the cloud that creates it starts with one direction of angular momentum (spin). This is because of the initial conditions as the gas cloud collapsed in on itself to create a star and planets around it. However, some orbits will move in the opposite direction but will normally be destroyed due to collisions with other orbits in the ...


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This video provides a visual answer: https://youtu.be/MTY1Kje0yLg?t=3m24s objects orbiting in different directions are more likely to collide with each other. By the process of elimination, eventually one direction of orbit dominates.



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