> I do understand, but for my money it's easier for the ship to affect the universe. Hear me out - the universe is static. The ship is active. The active force acts upon the static environment, no?

What the heck? No. No, no, no, no. When you run
down the street, trust me, it impacts you (i.e.,
you get where you're going, you get tired, you use
up your own personal store of energy, you
hyperventilate, etc) more than it impacts me
(i.e., there's a chance I might see you, but
probably not even that).