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Why Is Our Solar System Flat?
It started as a big old ball of dust, so how did it end up like a giant pancake? Our resident physicist tells the true story using fake forces.
This is a line in the sky that arcs from one spot on the horizon to another, basically following the path that the sun travels from where it rises to where it sets. If you make the circle that you're implicitly traveling around smaller (like a hairpin turn versus a long gradual curve), the centrifugal force would also increase. The masses closer to the axis of rotation, at the top and the bottom, accelerate toward the equatorial plane, forming a giant disk.
Or read this on Wired