Quoted from another forum.
It came with a scan from a comic, where they were saying Hulks body would be able to adapt even in outer space.t's in the same issue where his breathing apparatus is broken, he's eventually overcome by the weapon he was shot in space to fight and taken aboard it's satellite.
An issue or two later, Bruce transforms into Hulk to fight the weapon inside the satellite. The fight spills out into space, mind you, he no longer has his breathing apparatus and ends on the Moon.
So, yes, Hulk can survive in space. How long? I don't know if there's a determined amount of time, but it seems he doesn't need to breathe in space, anymore. Didn't he also beat the Skrull Black Bolt on the moon, as well?
So tossing him into space is, at best, a temporary solution.
Edit: Of course there is tossing him into the sun. Though really, I wonder if that would work? The amount of extreme enviroment Hulk is able to take without even being phased is rediculous.
So, it comes down to whether or not the sun equals instant death to Hulk. Otherwise that may not be enough.
Edit2: Hulk has, mind you, leapt off the planet before. If we go for the nigh invincible Hulk, with limitless power, if the sun can't kill him all that will happen is, eventually, he'd be mad enough to gain the strength to leap back to earth.
Mind you, this debate depends on how many of Hulks ridiculous stunts that he only pulls off every so often should be counted into his power here.![]()