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Ok, a bunch of interstellar dust began to collect in a slightly hotter region of the solar system. The gravitational attraction between these particles began to draw them closer and closer to each other. Since the density near the center of the cloud was constantly increasing, the kinetic energy of the cloud also increased. The outer parts of the dust cloud began to spiral around the center. Eventually, the gas in the center became so hot and dense that it condensed to form our sun, fusing its hydrogen particles into helium. The outer rings of space dust then began to condense at other key points around the sun, maintaining their orbital velocity but being held at a constant distance by the star's gravitational pull. These clouds of dust eventually condensed to form the planets and the asteroid belt. This explains why all the orbital paths of the planets are within a few degrees of the same plane. As for galaxies, just extrapolate that explanation to the next level, replacing the dust particles with stars. Mind-blowingly simple, right?

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