[quote=@Robeatics]
<Snipped quote by Ruby>

Yes, but we are still a long ways away from any other stars, and if (such as in Dark Knight Returns) Superman can go all withered and weak from just from taking massive amounts of damage while the sun is blotted out by dust, what would happen if he tried venturing into the depths of space in search of proper stars like the sun? If his immunity to space's extremes falters for even a second while he's zooming through the galaxy, boom, dead.

[/quote]

So you're saying...it's not the science, it's the comic writing that worries you.

Considering how inconsistent Supes can be written, I doubt any good comic writer would let it get in their way.