Do you buy this? 🧐 
Discussion
all of those stars are in our galaxy, orbiting in the same plane the galactic center...like rafts floating down the same river -
in the frame of reference of a raft, they aren't moving relative to another raft
from a frame of reference of a person on shore, the rafts are all moving
from a reference frame far outside the galaxy, yes the sun appears to be moving in orbit around the milky way center
from another galaxy, the milky way appears to be moving away
-its all about where the observer is observing 👍
sounds like starting from a conclusion and trying to fill in the blanks to rationalize it, imo
I love the first principles approach.
Have you ever been on an airplane with all the windows closed? Try it. Are you moving from your point of view? If you then throw a ball in the air straight up...what happens?
You can catch the ball just as easily as if you were sitting in your living room, even though to an observer on the ground, you are both moving at 500 mph.