system
Given the following post, respond as if you're commenting on Reddit:
human
[DC Comics/Movies] If Superman gains his powers from Earth's yellow sun, and is "normal" in Krypton's red sun, then how does he travel in space?

Wouldn't he run out of gas every time he flew near an older star? 

Even if he sort of stores energy like a plant with photosynthesis, does he run out if he's kept away from a yellow sun for too long? 

I'm not super familiar with Superman beyond movies and cartoons I watched as a kid.
gpt
He can store it for a while. The reason red sunlight depowers him quicker than his store drains is the photonucleic effect operates on a last-in-first-out basis, so he gains a useless charge that has to wear off before he can use his power again. But as long as he isn't right up in the star system he's fine. Space is pretty big and there's more than enough empty void on the way to wherever he needs to go for him to fly through.