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Big Bangs affect vast areas, a fact which man is aware of as all he can see seems to have been affected by the same event. But prior to clumping and becoming dense, matter is more homogeneous and fluid and thus each atom more easily influenced. As in all events, something came first, and as in all events, something clumps or moves first, and this sets the stage for what follows. Explosions send things in all directions, so motion outward is rapid and has no brakes other than the matter that lies behind it. Thus, matter on the periphery has push behind it, and matter closer to the center of the Big Bang finds it has no push behind it, eventually. The center is a void, and thus nearby matter, from the inside out, starts returning to this void to escape the crowding it finds everywhere else.
As this matter returns, it interacts with other matter, attempting to equalize crowding. Even in homogeneous matter any motion, even on the sub-atomic level with a single atom on the move, creates a zigzag due to the pressure created when moving in any direction. Motion become circular, to develop a spin, when any inequality on either side of the zigzag occurs, such that the zig or zag is not simply back and forth, but takes a curve. During the time it takes for galaxies to form from a Big Bang, matter is fluid for a long enough time for the motion in the center to affect and establish the motion throughout. This takes the form of individual or local dramas, here and there, but the synchronized spin of galaxies stands as a mute witness to the fluidity of the spurt coming out of a Big Bang, and to the extent to which what is called Dark Matter, which we have termed tiny matter, exists as a glue binding the Universe together in ways mankind little understands.