Starship Asterisk*

Case wrote:
There is no preferred direction for ejected material, and on top of that the sun rotates, meaning today’s thrust will be countered by next week’s trust in another direction. Over time, it can be expected that all these thrusts will roughly cancel each other out.

• However, the sun's large heliosphere "sail" is imperceptibly slowing the sun's motion through the interstellar medium.

https://en.wikipedia.org/wiki/Heliosphere#Bow_shock wrote:

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<<The heliosphere is the bubble-like region of space dominated by the Sun, which extends far beyond the orbit of Pluto. Plasma "blown" out from the Sun, known as the solar wind, creates and maintains this bubble against the outside pressure of the interstellar medium, the hydrogen and helium gas that permeates the Milky Way Galaxy. The solar wind flows outward from the Sun until encountering the termination shock, where motion slows abruptly. The Voyager spacecraft have explored the outer reaches of the heliosphere, passing through the shock and entering the heliosheath, a transitional region which is in turn bounded by the outermost edge of the heliosphere, called the heliopause. The shape of the heliosphere is controlled by the interstellar medium through which it is traveling, as well as the Sun and is not perfectly spherical. The limited data available and unexplored nature of these structures have resulted in many theories.>>