system
Given the following post, respond as if you're commenting on Reddit:
human
What COULD kill the Hulk?

Everything I read indicates he is nigh invulnerable. What would be able to kill him?
gpt
It's not entirely clear that anything could kill the Hulk due to his massive regeneration abilities however there are other options- Leaving him drifting in the vacuum of space with nothing to push against would likely render him harmless, as would throwing him into a strong gravity well (such as a star or a black hole).

It may also be possible to kill Bruce Banner fast enough, say with super speed, that he has no time to turn into the Hulk but some claim that Banner's death would simply free the Hulk permanently and remove his "off swithch".

Also note that Banner survived standing close to the detonation of a nuclear device so he's not easy to kill either.