Fluctuation Force & Distortion
If the driving force is the force on the same side but there are still many directions (Pic 1)

And when it has a long traveling line enough.... The result will show as Pic. 3 and 4 (respectively)

The Fluctuations & Distortion of Milky Way
From observing the Milky Way's image, it still looks whorl and has a little distorted (Pic 5)
In this picture shown that the expansion of the universe should have less fluctuations and with a clear direction.
Related Linked
Page1 Reverse
Page2 Direction
Page3 Line
Page4 Distortion
Page5 Driven