Re: I don't understand the diagram
Think of it like pulling something through water, you will always end up with a long wake trailing behind the boat. The same applies in gases and plasmas, even in the extremely low density of interstellar space.
The proportions in the artists view might be off, but you definitely would see a wake, trailing behind the solar system in its course around the galaxy.... It would be interesting to send out a Voyager 3 in the wake dimension to see just how long the wake is though... NASA hop to it... :)