there is no air in space, in real life, but in comics and Star Wars movies and the Super Friends TV cartoon show, there is.
-1 Karma!
There aren't any comics where there is air in space.
Paul Levitz gave an explanation for the Legionnaires' ability to survive in space without suits: they actually DID wear spacesuits, which were automatic transparent "trans-suits," designed to not interfere with powers, that activated on contact with vacuum.
The "trans-suits" were not activated by "sudden" changes, so the gas weapons in something like, say, Tharok/The Dark Man's citadel or Gas Girl (from the Champions of Lallor) could affect the Legionnaires normally.
All in all, a good explanation.
The only reason we breathe is to oxidize our food, to get the energy that we need. If Superman can store solar energy, then he doesn't need to breathe (arguably, he would still need to exhale, but that's it.)
That makes sense.
Yes, we can agree - Byrne´s Superman sucked as much as "For Tomorrow", but Byrne have done the greatest damage to the character. It was his revamp that destroyed everything unique and special about Superman, from cold and sterile Krypton to the supermurder storyline.
Don't forget the damage done to the Metal Men. Yeesh. That's an annoying Byrne obession: establish the inhumanity, the lack of personhood of robots.
Johnny Redbeard did it to the Vision in AVENGERS WEST COAST (a story arc that irritates me far, far more than his Superman reboot ever did). Here's a character that under Thomas and Englehart and others, acquired a soul, the ability to love. He acquired friendship, emotions, belonging. And Byrne called him a "toaster."
I never read "For Tomorrow," so I can't comment on whether it is better or worse. (Hear that, TELLE?
I'm keeping my mouth shut because I haven't read something. )