system
Given the following post, respond as if you're commenting on Reddit:
human
If the light omitted on the far side of a galaxy is significantly older than that of the front side, why isn't the shape distorted?

I can't wrap my head around this. In a galaxy that is, say, 100,000 light years across, why do we still see it as a "perfect" formation?
gpt
It takes 2500x as long as that (250M years) to rotate around the galaxy. So, in 100k years, the stars only shifted 0.144° . 

So, there is distortion, but it's not enough to ruin the seemingly "perfect" formation.