Many references I've read about The Sentry say his powers are limitless and no one actually know what he can't do. So my question is he can truly be killed?
In Seige, Thor kills him with a massive bolt of electricity then used the sun to destroy what was left. However from some sources there was part of the void within Emma Frost that moved on to Cyclops. Is the void part of the Sentry's powers or a complete new entity tied to Robert?
Another 'death' of the Sentry was in 'What If' where Thor snaps his neck. However he has seen to easily defeat Hulk and as it has shown he did defeat Thor.
But can he be killed? Any other information regarding the Sentry's powers and/or apparent death would be great.